function fromArray( buf, arr ) {
	var len;
	var i;

	len = arr.length;
	for ( i = 0; i < len; i++ ) {
		buf[ i ] = Boolean( arr[ i ] );
	}
	return buf;
}
Fills an output array with "boolean" values.

@private
@param {Uint8Array} buf - output array
@param {Array} arr - input array
@returns {Uint8Array} output array