Why was types moved to ptypes

[awalterschulze]

1270911
I am busy merging well known types into a fork of golang/protobuf
I would just like to know, since I'll probably prefer to keep the well known types in the types folder instead of the ptypes folder.

[zombiezen]

At the moment, I'm not sure (cc @okdave for comment). I like ptypes as a name since it aligns with advice around package names. In some ways, I think this is very similar to #218 (about to respond there more fully).

[okdave]

I think this was a discussion between @dsymonds and r; I wasn't involved in the reasoning (the main reason I can think of is that types might be confused with Go types).

[awalterschulze]

Thanks good to know.