3. Removal of extensions, which are instead replaced by a new standard type 
> called Any.

Extensions are used for custom options definition in proto2.

import "google/protobuf/descriptor.proto";

extend google.protobuf.MessageOptions {
  optional string my_option = 51234;

message MyMessage {
  option (my_option) = "Hello world!";

How it will look in proto3?

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