NewFilter builds a querystring.Filter that filters on name and optionally value.

NewMatcher builds a new querystring matcher.

NewModifier returns a request modifier that will set the query string at key with the given value.

NewVerifier returns a new param verifier.

Filter runs modifiers iff the request query parameter for name matches value.

Matcher is a conditonal evalutor of query string parameters to be used in structs that take conditions.