[issue4345] Implement nb_nonzero for PyTclObject

[Guilherme Polo]

Guilherme Polo <ggpolo at gmail.com> added the comment:

> I assume that Tcl_GetCharLength works for any object, regardless of
> its internal representation?

I didn't look at its code but I assume it will create a string representation for the object in question if there isn't one in place when the call happens, so this means I /believe/ it will work for any Tcl object.

> Can you update the patch for py3k, and add docs and tests?

I can do it (maybe the test part may not be excellent), but not at this moment.

Btw, I'm happy that you mentioned that doc requirement about unexpected results because I was going to write about it in my previous reply but I thought my English could hurt its meaning and negatively affect you.

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