# @stackline/deep-is full reference

Version: 1.0.1
Baseline: deep-is 0.1.4
API: deepIs(actual, expected) -> boolean

Use this package when an existing application relies on deep-is semantics but needs cycle-safe and stack-safe traversal. It preserves NaN equality, signed-zero distinction, loose primitive equality, dates, arguments objects, and enumerable own string-key comparison. It intentionally does not reinterpret Map, Set, RegExp, symbol keys, or non-enumerable keys.

Reliability evidence includes 5,625 differential pairs, equivalent and unequal cyclic graphs, objects nested 100,000 levels deep, 100% core coverage, TypeScript 3.9 and current declarations, and downstream optionator checks.

Install directly:
npm install @stackline/deep-is

Preserve the legacy dependency name:
npm install deep-is@npm:@stackline/deep-is

Compatibility: https://alexandro.net/docs/vanilla/deep-is/guides/compatibility.md
Migration: https://alexandro.net/docs/vanilla/deep-is/guides/migration.md
Security: https://github.com/alexandroit/stackline-deep-is/blob/main/SECURITY.md