Concordance JavaScript Value Utility

Concordance is a robust JavaScript utility library designed for deep comparison, human-readable formatting, detailed diffing, and consistent serialization of any JavaScript value. Currently stable at version 5.0.4, it maintains an active release cadence with frequent patch releases addressing minor issues and less frequent major versions that introduce breaking changes or significant feature enhancements. A key differentiator is its consistent underlying algorithm applied across all core operations—comparison, formatting, and diffing—ensuring predictable behavior. It offers granular control over comparisons, notably treating `-0` as distinct from `0`, `NaN` as equal to `NaN`, and comparing functions, promises, and symbols strictly by identity. Formatting is optimized for legibility, including special handling for multi-line strings and control characters. Concordance also supports serialization for later comparison, with specific behavioral changes noted when a deserialized value is used as the 'actual' value in comparisons.