How to test that an array is 'indexed' vs 'associative'

I have a class constructor that accepts an array as the only argument. The
catch is that the array MUST be an 'integer-indexed' array, not an
'associative' array, because the index position has meaning.

How can I test for this in the constructor without having to traverse the
entire array and checking to make sure the keys are numeric and sequential?

Daniel Klein
Cuyahoga Falls, OH
.

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