Revert "Fix schemas for bigdecimal/rust_decimal (GREsau#248)"

This reverts commit db1dd47.

# Conflicts:
#	schemars/Cargo.toml
#	schemars/tests/decimal.rs
#	schemars/tests/expected/bigdecimal03.json

schemars/Cargo.toml

@@ -123,9 +123,5 @@ required-features = ["smol_str"]
 name = "semver"
 required-features = ["semver"]
 
-[[test]]
-name = "decimal"
-required-features = ["rust_decimal", "bigdecimal03", "bigdecimal04"]
-
 [package.metadata.docs.rs]
 all-features = true

schemars/src/json_schema_impls/decimal.rs

@@ -5,11 +5,14 @@ use std::borrow::Cow;
 
 macro_rules! decimal_impl {
     ($type:ty) => {
+        decimal_impl!($type => Number, "Number");
+    };
+    ($type:ty => $instance_type:ident, $name:expr) => {
         impl JsonSchema for $type {
             no_ref_schema!();
 
             fn schema_name() -> String {
-                "Decimal".to_owned()
+                $name.to_owned()
             }
 
             fn schema_id() -> Cow<'static, str> {
@@ -18,11 +21,7 @@ macro_rules! decimal_impl {
 
             fn json_schema(_: &mut SchemaGenerator) -> Schema {
                 SchemaObject {
-                    instance_type: Some(InstanceType::String.into()),
-                    string: Some(Box::new(StringValidation {
-                        pattern: Some(r"^-?[0-9]+(\.[0-9]+)?$".to_owned()),
-                        ..Default::default()
-                    })),
+                    instance_type: Some(InstanceType::$instance_type.into()),
                     ..Default::default()
                 }
                 .into()