Feasibility
What the element does with an action outside a lever's feasible range.
REJECT is the default and the safe one: the rule learns that what it asked for was not available. CLAMP_THEN_REJECT repairs the request on ordered domains and re-checks it once, rejecting if it is still infeasible; a repaired action is recorded with the rule's original vector alongside it, so the trajectory shows both what was asked and what happened (§4.8.3).
Under either policy, a failing action writes no lever at all (§4.4.2).
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Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.