better boolean support with http query args

[Justin Wood]

(from: https://github.com/mozilla/build-relengapi/issues/197)

In my use case I have an endpoint that takes url query params. This endpoint's param should accept boolean values (Null/None, 1, 0, True, False) and case insensitive at that...

While, the wsme framework will convert anything other than "" and None python types to true, such that "0" and "false" are both True as per the endpoint.

So to clarify, I'd like:

    http://foo.com/bar?arg= -> False
    http://foo.com/bar?arg=0 -> False
    http://foo.com/bar?arg=false -> False
    http://foo.com/bar?arg=true -> True
    http://foo.com/bar?arg=1 -> True

[Christophe de Vienne (cdevienne)]

Sounds reasonable.
There may be somewhere some code depending on "0" or "false" to be True, so we need to be carefull but otherwise I am +1

[Christophe de Vienne (cdevienne)]

I would add "yes" and "no", and raise an error (maybe a deprecation-warning to start with) if a non-recognised string is found.