Fix content type determination for blob from fetch #2109
Merged
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Using a compatibility flag, selects the correct content type for a blob from the fetch-provided content-type header(s) as defined by the fetch spec: https://fetch.spec.whatwg.org/#concept-header-extract-mime-type
Sadly it's potentially breaking change so the compat flag is needed.
Fixes: #2099
Goal: Web standards compliance, bug fix