fix(core): Fix multipart FormData map field format #3118
Merged
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Summary
The multipart request spec actually specifies that
map
is of typeRecord<string, string[]>
rather thanRecord<string, string>
. While this is easy to miss, it's likely for upload deduplication, which we don't do but have to respect.Set of changes
FormData
map
field to[prop: string]: [string]