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Performs operator validation based on the Criterion specifications returned by Criterion::getSpecifications().

Returns the combination of the Criterion's supported operator/value, as an array of Specifications objects

• Specifications::$operator is a supported Operator constant.
• Specifications::$valueFormat is the type of input value this operator requires, either array (Specifications::FORMAT_ARRAY) or single (Specifications::FORMAT_SINGLE).
• Specifications::$valueTypes are bitwise flags of types the operator will accept (Specifications::TYPE_BOOLEAN, Specifications::TYPE_INTEGER, and/or Specifications::TYPE_STRING).
• Specifications::$valueCount is an integer saying how many values are expected.

// IN and EQ are supported
return [
    // The EQ operator expects a single value, either as an integer or a string
    new Specifications(
        Operator::EQ,
        Specifications::FORMAT_SINGLE,
        Specifications::TYPE_INTEGER | Specifications::TYPE_STRING
    ),
    // The IN operator expects an array of values, of either integers or strings
    new Specifications(
        Operator::IN,
        Specifications::FORMAT_ARRAY,
        Specifications::TYPE_INTEGER | Specifications::TYPE_STRING
    )
]