### ket fn: floor

floor:
description:
floor ket
take the floor function of the value in the ket label
while preserving the ket label category
if the value is not a number, then return the ket unchanged
also, we preserve the ket coefficient
examples:
-- floor of a simple number:
floor |2.7>
|2>
-- floor of a number with a category, in this case "number"
floor |number: 5.3>
|number: 5>
-- attempted floor of a non number:
floor |alpha>
|alpha>
see also:
ceiling, log

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