Extral Validation commands

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isint value
returns 1 if value is an integer, 0 if it is not
eg.:
	% isint 1
	1
	% isint a
	0
	% isint 1.2
	0
isdouble value
returns 1 if value is a real number, 0 if it is not
eg.:
	% isdouble 1.2
	1
	% isdouble 1
	1
	% isdouble a
	0
Peter De Rijk
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