We need to specify whether a BV provider should use TraversableResolver#isReachable() and isCascadable()) to check whether a validated method parameter or return value may be accessed/traversed during method validation.
If any of the checks shall be done for method validation, we need to update the TraversableResolver contract (section 4.6.3) which currently explicitly speaks about properties and is limited to the element types FIELD and METHOD.
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