[Proposal] Refer to actual value : keyword "itself"

[Imeian .]

When we need to change a value using the old value :

variable = itself + 5 // instead of
variable = variable + 5

object.child.property = itself / 5 // instead of
object.child.property = object.child.property / 5

Changing a value in nested objects is a pain, like Redux states for eg.

return {
    ...state,
    child: {
        ...state.child,
        subchild: {
            ...state.child.subchild,
            property: state.child.subchild.property + 1
        }
    }
}

would then be

return {
    ...state,
    child: {
        ...itself,
        subchild: {
            ...itself,
            property: itself + 1
        }
    }
}

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