glottalized intervocalic /y/?

[Yoram Meroz]

As the title says, I am curious about a feature I have run into
occasionally, where intervocalic /y/ surfaces as a glottal stop, for example
/bi?and/ "beyond", sometimes with a bit of a y glide left, e.g. /mei?@neiz/
"mayonnaise".

I have mostly heard it in California, and mostly by young women, though I do
not particularly associate it with a "valley girl" phonology.

How prevalent is this? Has anyone published anything about it?

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