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log ket
take the natural log 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

-- log of a simple number:
log |2.71828>
    |1>

-- log of a number with a category, in this case "number"
log |number: 5.3>
    |number: 1.66771>

-- attempted log of a non number:
log |alpha>
    |alpha>