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2.2.0

Added an option to set the starting index, useful to mitigate conflicts with third-party CSS files.
Performance improvements, including O(1) lookup of cached values rather than O(n), aborting PostCSS walk altogether when a negative index is found, and not running an optimize step if there are no z-index declarations.

2.1.1

Fixes an issue where all positive indices before a negative index were transformed (thanks to @niccai).

2.1.0

Now aborts early when encountering negative indices, making the transform safer overall.

2.0.1

Improved performance of the module by sorting/deduplicating values in one pass instead of per-value (thanks to @pgilad).

2.0.0

Upgraded to PostCSS 5.

1.1.3

Improved performance by iterating the AST in a single pass and caching nodes for the second iteration.

1.1.2

Documentation/metadata tweaks for plugin guidelines compatibility.

1.1.1

Corrected dependency tree when installing from npm.

1.1.0

Now uses the PostCSS 4.1 plugin API.

1.0.1

Adds a JSHint config, code tidied up.

1.0.0

Initial release.