ZCTextIndex uses binary data for WID

[jugmac00]

I updated my Zope app from Python 2 to Python 3 and all my ZCTextIndexes from ZCatalog are now broken.

TypeError: argument should be integer or bytes-like object, not 'str'

@d-maurer analyzed the problem:

But, the ZCTextIndex uses actually binary data (for the "WID" (= "WordInDEX") encoded document content) and there the heuristics breaks (apparently, no one has already told zodbupdate about this exception).

Initially reported here:
https://community.plone.org/t/typeerror-in-zctextindex-after-upgrade-to-py3/12621

I am not sure whether I should have created a mapping or this should have been detected by zodbupdate itself, as Products.ZCatalog is pretty much Zope standard.

[icemac]

This should probably be fixed in Products.ZCatalog. Moving the issue over there.

[icemac]

Might be a duplicate of #83.