no-compare-neg-zero

Disallow comparisons with negative zero

Equality and ordering comparisons produce the same result for negative and positive zero, so a comparison against negative zero cannot test its sign.
Instead, you SHOULD compare with zero and call .isSignNegative() when the sign matters.

- Category: correctness
- Level: warning
- Fix: none
- Scope: module

Reported

function isNegativeZero(value: float64): boolean {
    return value === -0.0;
}
Accepted

function isNegativeZero(value: float64): boolean {
    return value === 0.0 && value.isSignNegative();
}
Prior art

- ESLint · no-compare-neg-zero

language/linter/src/rules/correctness/nocomparenegzero.rs:6