#2401 eq with nominal units produces runtime error

[Jeremy Faden]

Ivar ran into a problem where code that made sense with nominal data didn't work. For example:

ds1= Units.nominal('space1').createDatum('A')
print eq(ds1,'A')

Should be True (1), but it results in a runtime error, because it tries to interpret "A" out of context (the nominal units from ds1).

[Jeremy Faden]

See https://github.com/autoplot/dev/blob/master/bugs/2021/20211015/nominalUnitCompare.jy