Incorrect parsing of tuples with trailing commas

Python 3.7.5 (default, Oct 27 2019, 15:43:29) 
[GCC 9.2.1 20191022] on linux
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>>> import pymbolic as pl
>>> pl.__version__
'2019.2'
>>> pl.parse('(2, 3,)')
((2, 3),) # Bug: should've been (2, 3)