Adding casts so that code importing protobug using -Wconversion does not generate warnings.
Adding casts so that code importing protobug using -Wconversion does not generate warnings.

google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf