request.GET.getlist default is [] instead of None

[JorisBenschop]

from ​https://docs.djangoproject.com/en/dev/ref/request-response/#django.http.QueryDict.getlist:

QueryDict.getlist(key, default=None)¶
Returns a list of the data with the requested key. Returns an empty list if the key doesn’t exist and a default value wasn’t provided

As far as I know an empty list, [] is not the same as None. should it thus not be rewritten as:

QueryDict.getlist(key, default=[ ])¶

[Tim Graham]

I'm not sure -- you think we should document that something that differs from ​the actual signature?

[Claude Paroz]

Agreed with Tim, the signature is right, the return value is explained in the paragraph. I can understand the confusion because the default default value is not the default return value.

[Carlton Gibson]

There's a ​PR with a small adjustment to the docs come in for this, which seems acceptable, so reopening to take that.

[GitHub <noreply@…>]

In 855fc062:

Fixed #29356 -- Clarified docs for QueryDict.getlist() default.

[Carlton Gibson <carlton.gibson@…>]

In b0e5e7b6:

[3.1.x] Fixed #29356 -- Clarified docs for QueryDict.getlist() default.

Backport of 855fc06236630464055b4f9ea422c68a07c6d02a from master