function isMostlySafeCast( from, to ) {
	if ( from === to ) {
		return true;
	}
	return ( TABLE[ from ][ to ] > 0 );
}
Returns a boolean indicating if a provided array data type can be safely cast or, for floating-point data types, downcast to another array data type.

@param {string} from - array data type
@param {string} to - array data type
@returns {boolean} boolean indicating if a data type can be cast to another data type

@example
var bool = isMostlySafeCast( 'float32', 'float64' );
// returns true

bool = isMostlySafeCast( 'float64', 'int32' );
// returns false