function enumeration() {
	return {
		// Half-maximum:
		'half-maximum': 0,

		// Left-continuous:
		'left-continuous': 1,

		// Right-continuous:
		'right-continuous': 2,

		// Discontinuous:
		'discontinuous': 3
	};
}
Returns an object mapping supported function continuity type strings to enumeration constants.

@private
@returns {Object} object mapping supported function continuity types to enumeration constants

@example
var table = enumeration();
// returns <Object>