Removing weird `is...` getters?

When first implementing this library, ObjC compatibility was in mind all the time.
And so, `is` getters were written too. The problem is, there was no feature like `getter=...` in Swift. (There's a relatively new option to use `@objc(is...)` on the getter, but that also requires declaring an additional private variable)

Now it seems that as Swift is getting more mature, there is not going to be such a feature.
Apple also tends to write Swift properties without the `is` prefix, unless there's only a getter.

I want to hear your thoughts, pros and cons, before making a decision on this.
Shoot.