function dtypeDesc( dtype ) {
	if ( arguments.length === 0 ) {
		return table();
	}
	if ( TABLE === void 0 ) {
		TABLE = table();
	}
	return TABLE[ resolve( dtype ) ] || null;
}
Returns the description for a provided data type.

@param {*} [dtype] - data type value
@returns {(Object|string|null)} description(s)

@example
var obj = dtypeDesc();
// returns {...}

@example
var desc = dtypeDesc( 'float64' );
// returns '...'

desc = dtypeDesc( 'generic' );
// returns '...'