Fix stale=false for views

[bessbd]

Overview

The docs mention an option of "false" for "stale" which is currently not supported and is rejected by validation.

This commit fixes the problem described above.

Testing recommendations

make eunit apps=couch_mrview suites=couch_mrview_http

Related Issues or Pull Requests

N/A

Checklist

• Code is written and works correctly
• Changes are covered by tests
• Any new configurable parameters are documented in rel/overlay/etc/default.ini -- not applicable
• A PR for documentation changes has been made in https://github.com/apache/couchdb-documentation -- this PR makes behavior match behavior described in https://docs.couchdb.org/en/stable/api/ddoc/views.html#api-ddoc-view

[eiri]

-1. This introduces new behaviour for deprecated query parameter stale, that while defaults to false never accepted it as a parameter before.

Since it's both 1) inconsistent with rest of the parameters "ok", "update_after" that are strings 2) is no-op, because it is just a default behaviour I suggest instead to update docs to remove ambiguity there.

[wohali]

I agree with @eiri here. The stale parameter was supposed to be deprecated in 3.x, but we gave it a reprieve until 4.0 (and maybe beyond that).

[bessbd]

Thank you for the feedback, @eiri and @wohali . I'll close this PR and open a new one for docs.