Consider
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-array.prototype.splice
step 10. It uses the phrasing "if deleteCount is not present" but I
can't find anything in the specification defining the concept of
"present" or "not present". So it's hard for me to tell what behavior
this is actually defining.
Is this supposed to be a typeof(deleteCount) == "undefined" test, an
argc test, or something else?
I'm assuming it's supposed to be the typeof() == "undefined" test, but
this should actually be specified somewhere. Perhaps as a definition in
section 4.3?
-Boris
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