[VM/values/operators] [`dec`] Verify for Web builds

[github-actions]

[VM/values/operators] [dec] Verify for Web builds
we should also check whether big integers work too!
(the same applies to its in-place equivalent)

arturo/src/vm/values/operators.nim

Line 673 in 04e57a1

# TODO(VM/values/operators) [`dec`] Verify for Web builds

        of Color      || Color          :   x.l -= y.l
        of Quantity   || Integer        :   x.q -= y.i
        of Quantity   || BigInteger     :   (when defined(GMP): x.q -= y.bi)
        of Quantity   || Floating       :   x.q -= y.f
        of Quantity   || Rational       :   x.q -= y.rat
        of Quantity   || Quantity       :   x.q -= y.q
        else:
            objectOperationOrNothing("sub", SubM, inplace=true)

# TODO(VM/values/operators) [`dec`] Verify for Web builds
#  we should also check whether big integers work too!
#  (the same applies to its in-place equivalent)
#  labels: unit-test, web, :integer

proc dec*(x: Value): Value =
    ## decrement given value and return the result

    case x.kind:
        of Integer:
            if x.iKind==NormalInteger: return normalIntegerDec(x.i)
            else: (when BignumSupport: return newInteger(x.bi-toBig(1)))
        of Floating: return newFloating(x.f-1.0)
        of Rational: return newRational(x.rat-1)
        of Complex: return newComplex(x.z-1.0)

6bae86af2461a887bc9fa60bb7c6341f1700739f

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