Interface: ConfigurableRequirementsInterface  - X-Ref

ConfigurableRequirementsInterface must be implemented by URL generators that
can be configured whether an exception should be generated when the parameters
do not match the requirements. It is also possible to disable the requirements
check for URL generation completely.

The possible configurations and use-cases:
- setStrictRequirements(true): Throw an exception for mismatching requirements. This
is mostly useful in development environment.
- setStrictRequirements(false): Don't throw an exception but return null as URL for
mismatching requirements and log the problem. Useful when you cannot control all
params because they come from third party libs but don't want to have a 404 in
production environment. It should log the mismatch so one can review it.
- setStrictRequirements(null): Return the URL with the given parameters without
checking the requirements at all. When generating a URL you should either trust
your params or you validated them beforehand because otherwise it would break your
link anyway. So in production environment you should know that params always pass
the requirements. Thus this option allows to disable the check on URL generation for
performance reasons (saving a preg_match for each requirement every time a URL is
generated).