tohil::eval aborts when trying to convert certain type(s) from Python to Tcl

[NasaGeek]

Reduce reproduction of some code from pyman that triggers this:

package require tohil
tohil::import inspect
puts [tohil::eval {inspect.getmembers(inspect)}]

This causes an abort in pyObjToTcl() because _pyObjToTcl() is returning NULL. Must be some Python data type in the inspect module that we're not converting right.