The default comparison condition for the subtype discriminator attribute is the equality comparison.
Strict equality compares two values for equality. Neither value is implicitly converted to another value before comparison. If the value types are different, the values are considered unequal. If the values are of the same type, are not numeric, and have the same value, they are considered equal.
The strict equality operator ( === ) tests whether two operands are equal and returns a Boolean result. Unlike the equality operator, the strict equality operator always treats operands of different types differently.
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