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	    s++;
	    if (s == send || (*s != 'T' && *s != 't'))
		return 0;
	    s++;
	    if (s == send || (*s != 'Y' && *s != 'y'))
		return 0;
	    s++;
	}
	sawinf = 1;
    } else if (*s == 'N' || *s == 'n') {
	/* XXX TODO: There are signaling NaNs and quiet NaNs. */
	s++;
	if (s == send || (*s != 'A' && *s != 'a'))
	    return 0;
	s++;
	if (s == send || (*s != 'N' && *s != 'n'))
	    return 0;
	s++;
	sawnan = 1;
    } else
	return 0;