[perl #128287] [BUG] Type check `Array[Foo]` in module gets confused if `Array[Foo]` was already referenced in another precompiled module.

[git...@zwell.net via RT]

Also, if you print the .WHICH values during BEGIN, you'll find that they're 
consistent, so the problem occurs either when compiling A.pm or reading the 
precompiled data.