Add conditional preservation behavior #116
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My goal was to give the user a more granular controll over the preservation behavior.
Initially I needed to find a way to preserve colors and fonts, but don't preserve URLs. Relative URLs are resolved differently in Safari and Chrome.
Now the user could define a callback for the "preserve" option:
cssvariables({ preserve: decl => shouldPreserve(decl) })I would be open and grateful for suggestions for improvement.