Access Violation with python 3.9 expressions

[nickroci]

from perspective import Table

tbl = Table({"a": [1, 2, 3], "b": ["a", "b", "c"]}, index="a")
tbl.view(expressions=['if("b"==1, 1, 2)']) # fine
tbl.view(expressions=['if("b"==\'a\', 1, 2)']) # segfault

I've only tested this in 3.9 and it seems to work fine on the javascript side

[sc1f]

Looking at this now - this seems to be a Python-only bug, and the simplest reduction of the problem is 'a' == 'a', which works fine in Javascript but fails in t_tscalar::operator== in Python.

[texodus]

Fix will be in 1.0.1