Repr broken for boolean columns

[jaychia]

Describe the bug

When repring dataframes with bool columns, we get an error thrown by our dependency tabulate.

This minimal repro for this is:

import tabulate

tabulate({"a": ["True", "False", "False"]},  maxcolwidths=20)

We can work around this temporarily by corner-casing the string repr of our booleans to lowercases instead, but this requires an upstream fix in tabulate.