infix operators, type 2: ==

 == :
    description:
        seq1 == seq2
        test whether seq1 is equal to seq2
        note that the order of kets in superpositions is not significant
        so you can shuffle a superposition and it will still be equal
        on the other hand, you can't sshuffle the sequences, that will break the equality

    examples:
        -- learn a couple of superpositions:
        sp |one> => split |abcde>
        sp |two> => shuffle sp |one>

        -- see what we know:
        sa: dump
            ------------------------------------------
            |context> => |Global context>

            sp |one> => |a> + |b> + |c> + |d> + |e>
            sp |two> => |e> + |a> + |d> + |c> + |b>
            ------------------------------------------

        -- now test for equality:
        sa: sp |one> == sp |two>
            |yes>

    see also:
        is-equal, != , >= , > , <= , <