[jira] [Created] (NUMBERS-218) ArithmeticUtils.pow rejects representable minimum-value powers

["Aryan Ganjoo (Jira)" <ji...@apache.org>]

Aryan Ganjoo created NUMBERS-218:
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             Summary: ArithmeticUtils.pow rejects representable minimum-value powers
                 Key: NUMBERS-218
                 URL: https://issues.apache.org/jira/browse/NUMBERS-218
             Project: Commons Numbers
          Issue Type: Bug
            Reporter: Aryan Ganjoo


ArithmeticUtils.pow(-2, 31) and ArithmeticUtils.pow(-2L, 63) throw ArithmeticException even though their exact results are Integer.MIN_VALUE and Long.MIN_VALUE. The API documents overflow only when the result cannot fit. Expected: those two calls return the minimum values; neighbouring overflowing powers, such as pow(2,31) and pow(-2,32), still throw. Actual: an early exponent guard rejects both valid boundary cases.

A standalone regression harness failed on pristine master 9b629bdfd72fc8c499795e32bf12909bf34a1f18 and passed with a local two-line guard correction. The new JUnit test and mvn -q -pl commons-numbers-core verify passed locally; a BigInteger comparison over a broad base/exponent range also found no mismatches after the correction. The fix is local and has not yet been submitted as a PR. NUMBERS-151 is a closed performance refinement concerning 0^0 and does not report this minimum-value boundary.



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