GeezerVison

Description

Fixes #1260

math.cbrt and math.exp2, added in Python 3.11, were missing from the math module. CPython defines both as math_1 wrappers over libm, with overflow checking for exp2 only (mathmodule.c#L1113-L1115, #L1174-L1176).

AS-IS

>>> math.cbrt(8)
AttributeError: module 'math' has no attribute 'cbrt'
>>> math.exp2(3)
AttributeError: module 'math' has no attribute 'exp2'

TO-BE

>>> math.cbrt(8)
2.0
>>> math.exp2(3)
8.0
>>> math.exp2(1024)
OverflowError: math range error

(matching CPython)

Changes

• Add CbrtNode, returning Math.cbrt(value).
• Add Exp2Node, returning Math.pow(2.0, value) with the same range check as ExpNode.
• Enable test.test_math.MathTests.testCbrt and testExp2 in unittest_tags/test_math.txt.

Testing

mx python-jvm on darwin-aarch64, then --tagged test_math (81 passed; master passes 79). Eighteen cbrt and exp2 calls, including infinities, NaN, -0.0 and the overflow case, return the same values as CPython 3.13.14.