Change is_utf16 field to encoding and use an enum

core/encoding/cbor/tags.odin

@@ -298,7 +298,7 @@ tag_base64_unmarshal :: proc(_: ^Tag_Implementation, d: Decoder, _: Tag_Number,
 
 	#partial switch t in ti.variant {
 	case reflect.Type_Info_String:
-		assert(!t.is_utf16)
+		assert(t.encoding == .UTF_8)
 		if t.is_cstring {
 			length  := base64.decoded_len(bytes)
 			builder := strings.builder_make(0, length+1)

core/encoding/cbor/unmarshal.odin

@@ -335,7 +335,7 @@ _unmarshal_value :: proc(d: Decoder, v: any, hdr: Header, allocator := context.a
 _unmarshal_bytes :: proc(d: Decoder, v: any, ti: ^reflect.Type_Info, hdr: Header, add: Add, allocator := context.allocator, loc := #caller_location) -> (err: Unmarshal_Error) {
 	#partial switch t in ti.variant {
 	case reflect.Type_Info_String:
-		assert(!t.is_utf16)
+		assert(t.encoding == .UTF_8)
 
 		bytes := err_conv(_decode_bytes(d, add, allocator=allocator, loc=loc)) or_return
 

core/encoding/json/unmarshal.odin

@@ -571,7 +571,7 @@ unmarshal_object :: proc(p: ^Parser, v: any, end_token: Token_Kind) -> (err: Unm
 
 			#partial switch tk in t.key.variant {
 				case runtime.Type_Info_String:
-					assert(!tk.is_utf16)
+					assert(tk.encoding == .UTF_8)
 
 					key_ptr = rawptr(&key)
 					key_cstr: cstring