[issue16809] Tk 8.6.0 introduces TypeError. (Tk 8.5.13 works)

[Roger Serwy]

Roger Serwy added the comment:

Serhiy, I applied your patch but I still get the same error. 

>From what I have found so far, the FromObj function in Modules/_tkinter.c relies on cached values for different Tcl_ObjType, as given in the TkappObject struct. From the comment:

    /* We cannot include tclInt.h, as this is internal.
       So we cache interesting types here. */

I haven't traced down the exact difference between 8.5 and 8.6 that causes the existing cached types to not match. The correct behavior from 8.5 is a match to "StringType". I've noticed a lot more macros in the 8.6 headers than in 8.5 which may be the culprit.

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<http://bugs.python.org/issue16809>
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