Suppressing warning of using is for CPython 3.8+.

References:

• purescript-python/purescript-python#9
• https://bugs.python.org/issue34850

Workaround metadata errors, PureScript compiler produces code with lineno=0:

References:

• purescript-python/purescript-python#8

Workaround for compating JavaScript incomplete arguments.

References:

• purescript-python/purescript-python#10