diff --git a/R-package/src/R_object_helper.h b/R-package/src/R_object_helper.h
index 0d51902da1dd..b961dc76c06e 100644
--- a/R-package/src/R_object_helper.h
+++ b/R-package/src/R_object_helper.h
@@ -98,10 +98,6 @@ typedef union { VECTOR_SER s; double align; } SEXPREC_ALIGN;
 
 #define R_CHAR_PTR(x)  (reinterpret_cast<char*>DATAPTR(x))
 
-#define R_INT_PTR(x)   (reinterpret_cast<int*> DATAPTR(x))
-
-#define R_REAL_PTR(x)  (reinterpret_cast<double*> DATAPTR(x))
-
 #define R_IS_NULL(x)   ((*reinterpret_cast<LGBM_SE>(x)).sxpinfo.type == 0)
 
 // 64bit pointer
diff --git a/R-package/src/lightgbm_R.cpp b/R-package/src/lightgbm_R.cpp
index 4d4adb84be3b..07a05763d9ca 100644
--- a/R-package/src/lightgbm_R.cpp
+++ b/R-package/src/lightgbm_R.cpp
@@ -43,11 +43,11 @@ using LightGBM::Common::Join;
 using LightGBM::Common::Split;
 using LightGBM::Log;
 
-LGBM_SE EncodeChar(LGBM_SE dest, const char* src, SEXP buf_len, LGBM_SE actual_len, size_t str_len) {
+LGBM_SE EncodeChar(LGBM_SE dest, const char* src, SEXP buf_len, SEXP actual_len, size_t str_len) {
   if (str_len > INT32_MAX) {
     Log::Fatal("Don't support large string in R-package");
   }
-  R_INT_PTR(actual_len)[0] = static_cast<int>(str_len);
+  INTEGER(actual_len)[0] = static_cast<int>(str_len);
   if (Rf_asInteger(buf_len) < static_cast<int>(str_len)) {
     return dest;
   }
@@ -76,9 +76,9 @@ SEXP LGBM_DatasetCreateFromFile_R(LGBM_SE filename,
   R_API_END();
 }
 
-SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
-  LGBM_SE indices,
-  LGBM_SE data,
+SEXP LGBM_DatasetCreateFromCSC_R(SEXP indptr,
+  SEXP indices,
+  SEXP data,
   SEXP num_indptr,
   SEXP nelem,
   SEXP num_row,
@@ -86,9 +86,9 @@ SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
   LGBM_SE reference,
   LGBM_SE out) {
   R_API_BEGIN();
-  const int* p_indptr = R_INT_PTR(indptr);
-  const int* p_indices = R_INT_PTR(indices);
-  const double* p_data = R_REAL_PTR(data);
+  const int* p_indptr = INTEGER(indptr);
+  const int* p_indices = INTEGER(indices);
+  const double* p_data = REAL(data);
 
   int64_t nindptr = static_cast<int64_t>(Rf_asInteger(num_indptr));
   int64_t ndata = static_cast<int64_t>(Rf_asInteger(nelem));
@@ -101,7 +101,7 @@ SEXP LGBM_DatasetCreateFromCSC_R(LGBM_SE indptr,
   R_API_END();
 }
 
-SEXP LGBM_DatasetCreateFromMat_R(LGBM_SE data,
+SEXP LGBM_DatasetCreateFromMat_R(SEXP data,
   SEXP num_row,
   SEXP num_col,
   LGBM_SE parameters,
@@ -110,7 +110,7 @@ SEXP LGBM_DatasetCreateFromMat_R(LGBM_SE data,
   R_API_BEGIN();
   int32_t nrow = static_cast<int32_t>(Rf_asInteger(num_row));
   int32_t ncol = static_cast<int32_t>(Rf_asInteger(num_col));
-  double* p_mat = R_REAL_PTR(data);
+  double* p_mat = REAL(data);
   DatasetHandle handle = nullptr;
   CHECK_CALL(LGBM_DatasetCreateFromMat(p_mat, C_API_DTYPE_FLOAT64, nrow, ncol, COL_MAJOR,
     R_CHAR_PTR(parameters), R_GET_PTR(reference), &handle));
@@ -119,7 +119,7 @@ SEXP LGBM_DatasetCreateFromMat_R(LGBM_SE data,
 }
 
 SEXP LGBM_DatasetGetSubset_R(LGBM_SE handle,
-  LGBM_SE used_row_indices,
+  SEXP used_row_indices,
   SEXP len_used_row_indices,
   LGBM_SE parameters,
   LGBM_SE out) {
@@ -129,7 +129,7 @@ SEXP LGBM_DatasetGetSubset_R(LGBM_SE handle,
   // convert from one-based to  zero-based index
 #pragma omp parallel for schedule(static, 512) if (len >= 1024)
   for (int i = 0; i < len; ++i) {
-    idxvec[i] = R_INT_PTR(used_row_indices)[i] - 1;
+    idxvec[i] = INTEGER(used_row_indices)[i] - 1;
   }
   DatasetHandle res = nullptr;
   CHECK_CALL(LGBM_DatasetGetSubset(R_GET_PTR(handle),
@@ -155,7 +155,7 @@ SEXP LGBM_DatasetSetFeatureNames_R(LGBM_SE handle,
 
 SEXP LGBM_DatasetGetFeatureNames_R(LGBM_SE handle,
   SEXP buf_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE feature_names) {
   R_API_BEGIN();
   int len = 0;
@@ -201,7 +201,7 @@ SEXP LGBM_DatasetFree_R(LGBM_SE handle) {
 
 SEXP LGBM_DatasetSetField_R(LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE field_data,
+  SEXP field_data,
   SEXP num_element) {
   R_API_BEGIN();
   int len = static_cast<int>(Rf_asInteger(num_element));
@@ -210,16 +210,16 @@ SEXP LGBM_DatasetSetField_R(LGBM_SE handle,
     std::vector<int32_t> vec(len);
 #pragma omp parallel for schedule(static, 512) if (len >= 1024)
     for (int i = 0; i < len; ++i) {
-      vec[i] = static_cast<int32_t>(R_INT_PTR(field_data)[i]);
+      vec[i] = static_cast<int32_t>(INTEGER(field_data)[i]);
     }
     CHECK_CALL(LGBM_DatasetSetField(R_GET_PTR(handle), name, vec.data(), len, C_API_DTYPE_INT32));
   } else if (!strcmp("init_score", name)) {
-    CHECK_CALL(LGBM_DatasetSetField(R_GET_PTR(handle), name, R_REAL_PTR(field_data), len, C_API_DTYPE_FLOAT64));
+    CHECK_CALL(LGBM_DatasetSetField(R_GET_PTR(handle), name, REAL(field_data), len, C_API_DTYPE_FLOAT64));
   } else {
     std::vector<float> vec(len);
 #pragma omp parallel for schedule(static, 512) if (len >= 1024)
     for (int i = 0; i < len; ++i) {
-      vec[i] = static_cast<float>(R_REAL_PTR(field_data)[i]);
+      vec[i] = static_cast<float>(REAL(field_data)[i]);
     }
     CHECK_CALL(LGBM_DatasetSetField(R_GET_PTR(handle), name, vec.data(), len, C_API_DTYPE_FLOAT32));
   }
@@ -228,7 +228,7 @@ SEXP LGBM_DatasetSetField_R(LGBM_SE handle,
 
 SEXP LGBM_DatasetGetField_R(LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE field_data) {
+  SEXP field_data) {
   R_API_BEGIN();
   const char* name = R_CHAR_PTR(field_name);
   int out_len = 0;
@@ -241,19 +241,19 @@ SEXP LGBM_DatasetGetField_R(LGBM_SE handle,
     // convert from boundaries to size
 #pragma omp parallel for schedule(static, 512) if (out_len >= 1024)
     for (int i = 0; i < out_len - 1; ++i) {
-      R_INT_PTR(field_data)[i] = p_data[i + 1] - p_data[i];
+      INTEGER(field_data)[i] = p_data[i + 1] - p_data[i];
     }
   } else if (!strcmp("init_score", name)) {
     auto p_data = reinterpret_cast<const double*>(res);
 #pragma omp parallel for schedule(static, 512) if (out_len >= 1024)
     for (int i = 0; i < out_len; ++i) {
-      R_REAL_PTR(field_data)[i] = p_data[i];
+      REAL(field_data)[i] = p_data[i];
     }
   } else {
     auto p_data = reinterpret_cast<const float*>(res);
 #pragma omp parallel for schedule(static, 512) if (out_len >= 1024)
     for (int i = 0; i < out_len; ++i) {
-      R_REAL_PTR(field_data)[i] = p_data[i];
+      REAL(field_data)[i] = p_data[i];
     }
   }
   R_API_END();
@@ -261,7 +261,7 @@ SEXP LGBM_DatasetGetField_R(LGBM_SE handle,
 
 SEXP LGBM_DatasetGetFieldSize_R(LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE out) {
+  SEXP out) {
   R_API_BEGIN();
   const char* name = R_CHAR_PTR(field_name);
   int out_len = 0;
@@ -271,7 +271,7 @@ SEXP LGBM_DatasetGetFieldSize_R(LGBM_SE handle,
   if (!strcmp("group", name) || !strcmp("query", name)) {
     out_len -= 1;
   }
-  R_INT_PTR(out)[0] = static_cast<int>(out_len);
+  INTEGER(out)[0] = static_cast<int>(out_len);
   R_API_END();
 }
 
@@ -282,20 +282,20 @@ SEXP LGBM_DatasetUpdateParamChecking_R(LGBM_SE old_params,
   R_API_END();
 }
 
-SEXP LGBM_DatasetGetNumData_R(LGBM_SE handle, LGBM_SE out) {
+SEXP LGBM_DatasetGetNumData_R(LGBM_SE handle, SEXP out) {
   int nrow;
   R_API_BEGIN();
   CHECK_CALL(LGBM_DatasetGetNumData(R_GET_PTR(handle), &nrow));
-  R_INT_PTR(out)[0] = static_cast<int>(nrow);
+  INTEGER(out)[0] = static_cast<int>(nrow);
   R_API_END();
 }
 
 SEXP LGBM_DatasetGetNumFeature_R(LGBM_SE handle,
-  LGBM_SE out) {
+  SEXP out) {
   int nfeature;
   R_API_BEGIN();
   CHECK_CALL(LGBM_DatasetGetNumFeature(R_GET_PTR(handle), &nfeature));
-  R_INT_PTR(out)[0] = static_cast<int>(nfeature);
+  INTEGER(out)[0] = static_cast<int>(nfeature);
   R_API_END();
 }
 
@@ -369,11 +369,11 @@ SEXP LGBM_BoosterResetParameter_R(LGBM_SE handle,
 }
 
 SEXP LGBM_BoosterGetNumClasses_R(LGBM_SE handle,
-  LGBM_SE out) {
+  SEXP out) {
   int num_class;
   R_API_BEGIN();
   CHECK_CALL(LGBM_BoosterGetNumClasses(R_GET_PTR(handle), &num_class));
-  R_INT_PTR(out)[0] = static_cast<int>(num_class);
+  INTEGER(out)[0] = static_cast<int>(num_class);
   R_API_END();
 }
 
@@ -385,8 +385,8 @@ SEXP LGBM_BoosterUpdateOneIter_R(LGBM_SE handle) {
 }
 
 SEXP LGBM_BoosterUpdateOneIterCustom_R(LGBM_SE handle,
-  LGBM_SE grad,
-  LGBM_SE hess,
+  SEXP grad,
+  SEXP hess,
   SEXP len) {
   int is_finished = 0;
   R_API_BEGIN();
@@ -394,8 +394,8 @@ SEXP LGBM_BoosterUpdateOneIterCustom_R(LGBM_SE handle,
   std::vector<float> tgrad(int_len), thess(int_len);
 #pragma omp parallel for schedule(static, 512) if (int_len >= 1024)
   for (int j = 0; j < int_len; ++j) {
-    tgrad[j] = static_cast<float>(R_REAL_PTR(grad)[j]);
-    thess[j] = static_cast<float>(R_REAL_PTR(hess)[j]);
+    tgrad[j] = static_cast<float>(REAL(grad)[j]);
+    thess[j] = static_cast<float>(REAL(hess)[j]);
   }
   CHECK_CALL(LGBM_BoosterUpdateOneIterCustom(R_GET_PTR(handle), tgrad.data(), thess.data(), &is_finished));
   R_API_END();
@@ -408,33 +408,33 @@ SEXP LGBM_BoosterRollbackOneIter_R(LGBM_SE handle) {
 }
 
 SEXP LGBM_BoosterGetCurrentIteration_R(LGBM_SE handle,
-  LGBM_SE out) {
+  SEXP out) {
   int out_iteration;
   R_API_BEGIN();
   CHECK_CALL(LGBM_BoosterGetCurrentIteration(R_GET_PTR(handle), &out_iteration));
-  R_INT_PTR(out)[0] = static_cast<int>(out_iteration);
+  INTEGER(out)[0] = static_cast<int>(out_iteration);
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetUpperBoundValue_R(LGBM_SE handle,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
-  double* ptr_ret = R_REAL_PTR(out_result);
+  double* ptr_ret = REAL(out_result);
   CHECK_CALL(LGBM_BoosterGetUpperBoundValue(R_GET_PTR(handle), ptr_ret));
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetLowerBoundValue_R(LGBM_SE handle,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
-  double* ptr_ret = R_REAL_PTR(out_result);
+  double* ptr_ret = REAL(out_result);
   CHECK_CALL(LGBM_BoosterGetLowerBoundValue(R_GET_PTR(handle), ptr_ret));
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetEvalNames_R(LGBM_SE handle,
   SEXP buf_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE eval_names) {
   R_API_BEGIN();
   int len;
@@ -465,11 +465,11 @@ SEXP LGBM_BoosterGetEvalNames_R(LGBM_SE handle,
 
 SEXP LGBM_BoosterGetEval_R(LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
   int len;
   CHECK_CALL(LGBM_BoosterGetEvalCounts(R_GET_PTR(handle), &len));
-  double* ptr_ret = R_REAL_PTR(out_result);
+  double* ptr_ret = REAL(out_result);
   int out_len;
   CHECK_CALL(LGBM_BoosterGetEval(R_GET_PTR(handle), Rf_asInteger(data_idx), &out_len, ptr_ret));
   CHECK_EQ(out_len, len);
@@ -478,19 +478,19 @@ SEXP LGBM_BoosterGetEval_R(LGBM_SE handle,
 
 SEXP LGBM_BoosterGetNumPredict_R(LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out) {
+  SEXP out) {
   R_API_BEGIN();
   int64_t len;
   CHECK_CALL(LGBM_BoosterGetNumPredict(R_GET_PTR(handle), Rf_asInteger(data_idx), &len));
-  R_INT_PTR(out)[0] = static_cast<int>(len);
+  INTEGER(out)[0] = static_cast<int>(len);
   R_API_END();
 }
 
 SEXP LGBM_BoosterGetPredict_R(LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
-  double* ptr_ret = R_REAL_PTR(out_result);
+  double* ptr_ret = REAL(out_result);
   int64_t out_len;
   CHECK_CALL(LGBM_BoosterGetPredict(R_GET_PTR(handle), Rf_asInteger(data_idx), &out_len, ptr_ret));
   R_API_END();
@@ -535,20 +535,20 @@ SEXP LGBM_BoosterCalcNumPredict_R(LGBM_SE handle,
   SEXP is_predcontrib,
   SEXP start_iteration,
   SEXP num_iteration,
-  LGBM_SE out_len) {
+  SEXP out_len) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
   int64_t len = 0;
   CHECK_CALL(LGBM_BoosterCalcNumPredict(R_GET_PTR(handle), Rf_asInteger(num_row),
     pred_type, Rf_asInteger(start_iteration), Rf_asInteger(num_iteration), &len));
-  R_INT_PTR(out_len)[0] = static_cast<int>(len);
+  INTEGER(out_len)[0] = static_cast<int>(len);
   R_API_END();
 }
 
 SEXP LGBM_BoosterPredictForCSC_R(LGBM_SE handle,
-  LGBM_SE indptr,
-  LGBM_SE indices,
-  LGBM_SE data,
+  SEXP indptr,
+  SEXP indices,
+  SEXP data,
   SEXP num_indptr,
   SEXP nelem,
   SEXP num_row,
@@ -558,18 +558,18 @@ SEXP LGBM_BoosterPredictForCSC_R(LGBM_SE handle,
   SEXP start_iteration,
   SEXP num_iteration,
   LGBM_SE parameter,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
 
-  const int* p_indptr = R_INT_PTR(indptr);
-  const int* p_indices = R_INT_PTR(indices);
-  const double* p_data = R_REAL_PTR(data);
+  const int* p_indptr = INTEGER(indptr);
+  const int* p_indices = INTEGER(indices);
+  const double* p_data = REAL(data);
 
   int64_t nindptr = Rf_asInteger(num_indptr);
   int64_t ndata = Rf_asInteger(nelem);
   int64_t nrow = Rf_asInteger(num_row);
-  double* ptr_ret = R_REAL_PTR(out_result);
+  double* ptr_ret = REAL(out_result);
   int64_t out_len;
   CHECK_CALL(LGBM_BoosterPredictForCSC(R_GET_PTR(handle),
     p_indptr, C_API_DTYPE_INT32, p_indices,
@@ -579,7 +579,7 @@ SEXP LGBM_BoosterPredictForCSC_R(LGBM_SE handle,
 }
 
 SEXP LGBM_BoosterPredictForMat_R(LGBM_SE handle,
-  LGBM_SE data,
+  SEXP data,
   SEXP num_row,
   SEXP num_col,
   SEXP is_rawscore,
@@ -588,15 +588,15 @@ SEXP LGBM_BoosterPredictForMat_R(LGBM_SE handle,
   SEXP start_iteration,
   SEXP num_iteration,
   LGBM_SE parameter,
-  LGBM_SE out_result) {
+  SEXP out_result) {
   R_API_BEGIN();
   int pred_type = GetPredictType(is_rawscore, is_leafidx, is_predcontrib);
 
   int32_t nrow = Rf_asInteger(num_row);
   int32_t ncol = Rf_asInteger(num_col);
 
-  const double* p_mat = R_REAL_PTR(data);
-  double* ptr_ret = R_REAL_PTR(out_result);
+  const double* p_mat = REAL(data);
+  double* ptr_ret = REAL(out_result);
   int64_t out_len;
   CHECK_CALL(LGBM_BoosterPredictForMat(R_GET_PTR(handle),
     p_mat, C_API_DTYPE_FLOAT64, nrow, ncol, COL_MAJOR,
@@ -618,7 +618,7 @@ SEXP LGBM_BoosterSaveModelToString_R(LGBM_SE handle,
   SEXP num_iteration,
   SEXP feature_importance_type,
   SEXP buffer_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE out_str) {
   R_API_BEGIN();
   int64_t out_len = 0;
@@ -633,7 +633,7 @@ SEXP LGBM_BoosterDumpModel_R(LGBM_SE handle,
   SEXP num_iteration,
   SEXP feature_importance_type,
   SEXP buffer_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE out_str) {
   R_API_BEGIN();
   int64_t out_len = 0;
diff --git a/R-package/src/lightgbm_R.h b/R-package/src/lightgbm_R.h
index 5ef54385f256..97438c87253d 100644
--- a/R-package/src/lightgbm_R.h
+++ b/R-package/src/lightgbm_R.h
@@ -53,9 +53,9 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromFile_R(
 * \return 0 when succeed, -1 when failure happens
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromCSC_R(
-  LGBM_SE indptr,
-  LGBM_SE indices,
-  LGBM_SE data,
+  SEXP indptr,
+  SEXP indices,
+  SEXP data,
   SEXP num_indptr,
   SEXP nelem,
   SEXP num_row,
@@ -75,7 +75,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromCSC_R(
 * \return 0 when succeed, -1 when failure happens
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromMat_R(
-  LGBM_SE data,
+  SEXP data,
   SEXP num_row,
   SEXP num_col,
   LGBM_SE parameters,
@@ -94,7 +94,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetCreateFromMat_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetSubset_R(
   LGBM_SE handle,
-  LGBM_SE used_row_indices,
+  SEXP used_row_indices,
   SEXP len_used_row_indices,
   LGBM_SE parameters,
   LGBM_SE out
@@ -120,7 +120,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetSetFeatureNames_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetFeatureNames_R(
   LGBM_SE handle,
   SEXP buf_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE feature_names
 );
 
@@ -157,7 +157,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetFree_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetSetField_R(
   LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE field_data,
+  SEXP field_data,
   SEXP num_element
 );
 
@@ -171,7 +171,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetSetField_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetFieldSize_R(
   LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE out
+  SEXP out
 );
 
 /*!
@@ -184,7 +184,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetFieldSize_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetField_R(
   LGBM_SE handle,
   LGBM_SE field_name,
-  LGBM_SE field_data
+  SEXP field_data
 );
 
 /*!
@@ -206,7 +206,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetUpdateParamChecking_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetNumData_R(
   LGBM_SE handle,
-  LGBM_SE out
+  SEXP out
 );
 
 /*!
@@ -217,7 +217,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetNumData_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_DatasetGetNumFeature_R(
   LGBM_SE handle,
-  LGBM_SE out
+  SEXP out
 );
 
 // --- start Booster interfaces
@@ -318,7 +318,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterResetParameter_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetNumClasses_R(
   LGBM_SE handle,
-  LGBM_SE out
+  SEXP out
 );
 
 /*!
@@ -341,8 +341,8 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterUpdateOneIter_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterUpdateOneIterCustom_R(
   LGBM_SE handle,
-  LGBM_SE grad,
-  LGBM_SE hess,
+  SEXP grad,
+  SEXP hess,
   SEXP len
 );
 
@@ -362,7 +362,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterRollbackOneIter_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetCurrentIteration_R(
   LGBM_SE handle,
-  LGBM_SE out
+  SEXP out
 );
 
 /*!
@@ -373,7 +373,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetCurrentIteration_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetUpperBoundValue_R(
     LGBM_SE handle,
-    LGBM_SE out_result
+    SEXP out_result
 );
 
 /*!
@@ -384,7 +384,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetUpperBoundValue_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetLowerBoundValue_R(
     LGBM_SE handle,
-    LGBM_SE out_result
+    SEXP out_result
 );
 
 /*!
@@ -395,7 +395,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetLowerBoundValue_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEvalNames_R(
   LGBM_SE handle,
   SEXP buf_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE eval_names
 );
 
@@ -409,7 +409,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEvalNames_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEval_R(
   LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out_result
+  SEXP out_result
 );
 
 /*!
@@ -422,7 +422,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetEval_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetNumPredict_R(
   LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out
+  SEXP out
 );
 
 /*!
@@ -436,7 +436,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetNumPredict_R(
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterGetPredict_R(
   LGBM_SE handle,
   SEXP data_idx,
-  LGBM_SE out_result
+  SEXP out_result
 );
 
 /*!
@@ -481,7 +481,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterCalcNumPredict_R(
   SEXP is_predcontrib,
   SEXP start_iteration,
   SEXP num_iteration,
-  LGBM_SE out_len
+  SEXP out_len
 );
 
 /*!
@@ -504,9 +504,9 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterCalcNumPredict_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
   LGBM_SE handle,
-  LGBM_SE indptr,
-  LGBM_SE indices,
-  LGBM_SE data,
+  SEXP indptr,
+  SEXP indices,
+  SEXP data,
   SEXP num_indptr,
   SEXP nelem,
   SEXP num_row,
@@ -516,7 +516,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
   SEXP start_iteration,
   SEXP num_iteration,
   LGBM_SE parameter,
-  LGBM_SE out_result
+  SEXP out_result
 );
 
 /*!
@@ -536,7 +536,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForCSC_R(
 */
 LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForMat_R(
   LGBM_SE handle,
-  LGBM_SE data,
+  SEXP data,
   SEXP num_row,
   SEXP num_col,
   SEXP is_rawscore,
@@ -545,7 +545,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterPredictForMat_R(
   SEXP start_iteration,
   SEXP num_iteration,
   LGBM_SE parameter,
-  LGBM_SE out_result
+  SEXP out_result
 );
 
 /*!
@@ -574,7 +574,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterSaveModelToString_R(
   SEXP num_iteration,
   SEXP feature_importance_type,
   SEXP buffer_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE out_str
 );
 
@@ -590,7 +590,7 @@ LIGHTGBM_C_EXPORT SEXP LGBM_BoosterDumpModel_R(
   SEXP num_iteration,
   SEXP feature_importance_type,
   SEXP buffer_len,
-  LGBM_SE actual_len,
+  SEXP actual_len,
   LGBM_SE out_str
 );
 
diff --git a/R-package/tests/testthat/test_basic.R b/R-package/tests/testthat/test_basic.R
index 8e857450ce61..a49c728d2e19 100644
--- a/R-package/tests/testthat/test_basic.R
+++ b/R-package/tests/testthat/test_basic.R
@@ -1247,6 +1247,38 @@ test_that("lgb.train() supports non-ASCII feature names", {
   }
 })
 
+test_that("lgb.train() works with integer, double, and numeric data", {
+  data(mtcars)
+  X <- as.matrix(mtcars[, -1L])
+  y <- mtcars[, 1L, drop = TRUE]
+  expected_mae <- 4.263667
+  for (data_mode in c("numeric", "double", "integer")) {
+    mode(X) <- data_mode
+    nrounds <- 10L
+    bst <- lightgbm(
+      data = X
+      , label = y
+      , params = list(
+        objective = "regression"
+        , min_data = 1L
+        , learning_rate = 0.01
+        , seed = 708L
+      )
+      , nrounds = nrounds
+    )
+
+    # should have trained for 10 iterations and found splits
+    modelDT <- lgb.model.dt.tree(bst)
+    expect_equal(modelDT[, max(tree_index)], nrounds - 1L)
+    expect_gt(nrow(modelDT), nrounds * 3L)
+
+    # should have achieved expected performance
+    preds <- predict(bst, X)
+    mae <- mean(abs(y - preds))
+    expect_true(abs(mae - expected_mae) < TOLERANCE)
+  }
+})
+
 test_that("when early stopping is not activated, best_iter and best_score come from valids and not training data", {
   set.seed(708L)
   trainDF <- data.frame(