/* trim whitespace from right side. */

		char *e = s + strlen(s);

		while (e > s && ((c = e[-1]) == '\n' || c == '\r' || c == ' ' || c == '\t')) e--;

		*e = '\0';

		/* Skip comments and empty lines outside IGT_SEQUENCE groups. */

		if ((group == nullptr || group->type != IGT_SEQUENCE) && (*s == '#' || *s == ';' || *s == '\0')) {

			uint ns = comment_size + (e - s + 1);

			uint a = comment_alloc;

			/* add to comment */

			if (ns > a) {

				do a *= 2; while (a < ns);

				comment = ReallocT(comment, comment_alloc = a);

			}

			uint pos = comment_size;

			comment_size += (e - s + 1);

			comment[pos + e - s] = '\n'; // comment newline

			memcpy(comment + pos, s, e - s); // copy comment contents

			continue;

		}

		/* it's a group? */

		if (s[0] == '[') {