kubernetes/vendor/google.golang.org/protobuf/proto/merge.go

// Merge merges src into dst, which must be a message with the same descriptor.
//
// Populated scalar fields in src are copied to dst, while populated
// singular messages in src are merged into dst by recursively calling Merge.
// The elements of every list field in src is appended to the corresponded
// list fields in dst. The entries of every map field in src is copied into
// the corresponding map field in dst, possibly replacing existing entries.
// The unknown fields of src are appended to the unknown fields of dst.
//
// It is semantically equivalent to unmarshaling the encoded form of src
// into dst with the [UnmarshalOptions.Merge] option specified.
func Merge(dst, src Message) { … }

// Clone returns a deep copy of m.
// If the top-level message is invalid, it returns an invalid message as well.
func Clone(m Message) Message { … }

type mergeOptions …

func (o mergeOptions) mergeMessage(dst, src protoreflect.Message) { … }

func (o mergeOptions) mergeList(dst, src protoreflect.List, fd protoreflect.FieldDescriptor) { … }

func (o mergeOptions) mergeMap(dst, src protoreflect.Map, fd protoreflect.FieldDescriptor) { … }

func (o mergeOptions) cloneBytes(v protoreflect.Value) protoreflect.Value { … }