_PACKAGE in a nested module

["Matthew M. Burke" <mmburke@...>]

If you create a module, call it peanut, with a nested module, say 
butter.  And then print(peanut.butter._PACKAGE) the answer you get is 
"peanut." with the trailing period.

I would expect the answer to just be "peanut".

Similarly, if you define a module, peanut.butter.sandwich, and then 
print(peanut.butter.sandwich._PACKAGE) you get "peanut.butter.".

Is that the intended behavior?

Matt