operator: is-less-than

    description:
        is-less-than[value] ket
        returns yes/no if value < the value in ket
      
    examples:
        is-less-than[80] |age: 76>
            |yes>
        
        is-less-than[2000] |year: 2018>
            |no>

        -- if the ket has no float value, then return |>
        is-less-than[13] |the cat>
            |>

    see also:
        is-greater-than, is-greater-equal-than, is-less-equal-than, is-equal, is-in-range
        greater-than, greater-equal-than, less-than, less-equal-than, equal, in-range

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