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You can test an object to see whether it is a marker, or whether it is either an integer or a marker. The latter test is useful in connection with the arithmetic functions that work with both markers and integers.
tif object is a marker,
nilotherwise. Note that integers are not markers, even though many functions will accept either a marker or an integer.
tif object is an integer or a marker,
tif object is a number (either integer or floating point) or a marker,
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