fix: handle option types and nulls properly

src/main/kotlin/app/revanced/patcher/patch/PatchOption.kt

@@ -81,6 +81,12 @@ sealed class PatchOption<T>(
     val validator: (T?) -> Boolean
 ) {
     var value: T? = default
+        get() {
+            if (field == null && required) {
+                throw RequirementNotMetException
+            }
+            return field
+        }
         set(value) {
             if (value == null && required) {
                 throw RequirementNotMetException
@@ -95,7 +101,11 @@ sealed class PatchOption<T>(
      * Gets the value of the option.
      * Please note that using the wrong value type results in a runtime error.
      */
-    operator fun <T> getValue(thisRef: Any?, property: KProperty<*>) = value as T
+    inline operator fun <reified V> getValue(thisRef: Any?, property: KProperty<*>) =
+        value as? V ?: throw InvalidTypeException(
+            V::class.java.canonicalName,
+            value?.let { it::class.java.canonicalName } ?: "null"
+        )
 
     /**
      * Gets the value of the option.

src/test/kotlin/app/revanced/patcher/patch/PatchOptionsTest.kt

@@ -85,9 +85,16 @@ internal class PatchOptionsTest {
     }
 
     @Test
-    fun `should fail because of the requirement is not met`() {
+    fun `should fail because the requirement is not met`() {
         assertThrows<RequirementNotMetException> {
             options.nullify("key1")
         }
     }
+
+    @Test
+    fun `should fail because getting a non-initialized option is illegal`() {
+        assertThrows<RequirementNotMetException> {
+            println(options["key6"].value)
+        }
+    }
 }

src/test/kotlin/app/revanced/patcher/usage/bytecode/ExampleBytecodePatch.kt

@@ -196,5 +196,10 @@ class ExampleBytecodePatch : BytecodePatch(listOf(ExampleFingerprint)) {
                 "key5", File("test.txt").toPath(), "title", "description"
             )
         )
+        private var key6: String by option(
+            PatchOption.StringOption(
+                "key6", null, "title", "description", true
+            )
+        )
     }
 }