Claus Reinke wrote:
Allen rallied me to the prefix-! route by objecting that prefix-?
would not be available outside of patterns, which simply highlights
how JS already imputes undefined for missing property.
Could you expand on this? Refutable vs irrefutable only applies to
patterns so far, though one could imagine property selectors with
early failure to complement the current succeed-with-undefined.
Allen's post is up-thread about 14 messages:
https://mail.mozilla.org/pipermail/es-discuss/2012-June/023719.html
/be
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