Revert "Add functions for field presence (#717)"

This reverts commit 93797f3.

docs/runtime_api.md

@@ -10,7 +10,6 @@ provided by the library.
   - [Default field values](#default-field-values)
   - [Accessing fields](#accessing-fields)
   - [Accessing oneof groups](#accessing-oneof-groups)
-  - [Field presence](#field-presence)
   - [Cloning messages](#cloning-messages)
   - [Comparing messages](#comparing-messages)
   - [Serializing messages](#serializing-messages)
@@ -234,27 +233,6 @@ the TypeScript compiler option [`strictNullChecks`](https://www.typescriptlang.o
 This option is automatically enabled with the option `strict`, which is recommended.
 
 
-### Field presence
-
-As we explained above, fields have [default values](#default-field-values). To 
-determine whether a field has an actual value, you can use the function `isFieldSet`.
-To reset a field to its initial value, use the function `clearField`.
-
-```typescript
-import { isFieldSet, clearField } from "@bufbuild/protobuf";
-
-const user = new User({
-  active: true,
-});
-
-isFieldSet(user, "active"); // true
-isFieldSet(user, "firstName"); // false
-
-clearField(user, "active");
-isFieldSet(user, "active"); // false
-```
-
-
 ### Cloning messages
 
 While a shallow copy of a message can be created by using the spread operator with the
@@ -761,9 +739,6 @@ walkFields(user);
 For a more practical example that covers all cases, you can take a look at the 
 source of [`toPlainMessage`][src-toPlainMessage].
 
-Not that the functions `isFieldSet` and `clearField` (see [Field presence](#field-presence)) 
-optionally accept a field info object instead of a field name.
-
 
 ### Message types
 

packages/protobuf-bench/README.md

@@ -10,5 +10,5 @@ server would usually do.
 
 | code generator      | bundle size             | minified               | compressed         |
 |---------------------|------------------------:|-----------------------:|-------------------:|
-| protobuf-es         | 97,073 b      | 41,481 b | 10,747 b |
+| protobuf-es         | 96,999 b      | 41,438 b | 10,763 b |
 | protobuf-javascript | 394,384 b  | 288,654 b | 45,122 b |

packages/protobuf-test/extra/proto3.proto

@@ -29,36 +29,21 @@ message Proto3UnpackedMessage {
   repeated uint64 unpacked_uint64_field = 203 [packed = false];
 }
 
-message Proto3UnspecifiedPackedMessage {
+message Proto3UnlabelledMessage {
   repeated double double_field = 1;
   repeated uint32 uint32_field = 2;
   repeated uint64 uint64_field = 3;
 }
 
-message Proto3UnlabelledMessage {
-  string string_field = 1;
-  bytes bytes_field = 2;
-  int32 int32_field = 3;
-  int64 int64_field = 4;
-  float float_field = 5;
-  bool bool_field = 6;
-  Proto3Enum enum_field = 7;
-  Proto3OptionalMessage message_field = 8;
-}
-
 message Proto3OptionalMessage {
   optional string string_field = 1;
   optional bytes bytes_field = 2;
-  optional int32 int32_field = 3;
-  optional int64 int64_field = 4;
-  optional float float_field = 5;
-  optional bool bool_field = 6;
-  optional Proto3Enum enum_field = 7;
-  optional Proto3OptionalMessage message_field = 8;
+  optional Proto3Enum enum_field = 3;
+  optional Proto3OptionalMessage message_field = 4;
 }
 
 enum Proto3Enum {
   PROTO3_ENUM_UNSPECIFIED = 0;
   PROTO3_ENUM_YES = 1;
   PROTO3_ENUM_NO = 2;
-}
+}