Array parameter inconsistency with multipart/formdata

[thekid]

✅ Using application/x-www-form-urlencoded with development and standalone servers:

$ curl -v localhost:8080 -d 'p[0][]=a&p[0][]=b'
{"p":[["a","b"]]}

✅ Using multipart/form-data with development server:

$ curl -v localhost:8080 -F 'p[0][]=a' -F 'p[0][]=b'
{"p":[["a","b"]]}

🛑 Using multipart/form-data with standalone server

$ curl -v localhost:8080 -F 'p[0][]=a' -F 'p[0][]=b'
{"p":[["a"],["b"]]}

[thekid]

There were actually more inconsistencies I found while developing a fix for this:

1. PHP replaces spaces and dots with an underscore (for BC reasons with when parse_str() would affect the global symbol table)
2. PHP strips leading whitespace from parameters: < p> becomes <p> (this is undocumented but can be found in the PHP source code)