ClearFields clears all fields annotated with any of the provided behaviors.

CopyFields copies all fields annotated with any of the provided behaviors from src to dst.

Get returns the field behavior of the provided field descriptor.

Has returns true if the provided field descriptor has the wanted field behavior.

ValidateImmutableFieldsWithMask returns a validation error if the message or field mask contains a field that is immutable and a change to an immutable field is requested.

ValidateRequiredFields returns a validation error if any field annotated as required does not have a value.