Always send previous values through Mutation Observer callbacks #618
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CharlesTaylor7
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Hi @CharlesTaylor7 can I ask for a test for this PR? |
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This ensures mutation observers always are passing both current and previous values.
That feature was already working for mutation value of "characterData" or "attributes", but now it will handle do this when listening to both via the "anything" keyword.
Relevant docs for the browser API:
https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver/observe#parameters