Why commas over repeated key?

#1

The docs use:

fields[articles]=title,body

Instead of:

fields[articles]=title&fields[articles]=body

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#2

At least one reason could be that on a lot of platforms only one value would be available: given that HTTP (URI)-specific RFCs don’t put any specifics on query parameters any parsing behaviour is “valid”. So if you use the former - you would need to implement your own URI parser.