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As far as I can tell, there are no pressing reasons for this change (as in, this is
not addressing an immediate security threat). It's just a preventive measure to
reduce unnecessary exposure.
Using
JSON.load
on untrusted input is considered unsafe. While the MIME typedefinition files would presumably come from a trusted source, there doesn't seem
to be a need for the "extra" stuff that
JSON.load
does in here, so switchingover to the safer
JSON.parse
API should help to reduce exposure.