Implement non equality operator

[raffaelemancuso]

jira ticket

https://dereckmezquita.atlassian.net/browse/

todo list

• Version bump

[raffaelemancuso]

@dereckmezquita is the PR useful?

[dereckmezquita]

It does indeed, thank you @raffaem

I do comment that the enum function is experimental at this point - I don't like that we have to create a list and access the value via $value. I am still looking for a way to "bypass" the R interpreter or do something clever with R so we can do something more like this:

box::use(interface[enum])

Colours <- enum("red", "green")
myCarColour <- Colours("red")
try(myCarColour <- "yellow") # throws; no need for `$value` - this is tricky since I can't find a reliable way to intercept the assignment

Although as I dive deeper into the R runtime I am acquiescing to keeping the current syntax; it seems it is not possible to override <- per variable as I wished.

[dereckmezquita]

@raffaem please go ahead and add yourself as a contributor following the same pattern as data.table seen here: https://github.com/Rdatatable/data.table/blob/master/DESCRIPTION