[issue4345] Implement nb_nonzero for PyTclObject

[Guilherme Polo]

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

Mark,

If you want to expand it to handle other data types, I'm ok with it
but I predict troubles for you. The problem is that in Tcl there is
only one "real" data type -- string. Depending on how you operate over
a value it is then, internally, treated as something more specific but
this is not directly exposed for the "API users".

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