Most validators should not validate null input, because that condition is validated with NotNull. LengthValidator assumes a length of 0 for null, breaking the convention.
I think LengthValidator should return true for null inputs.
Comments: I've made this change in the latest commit. Let me know how it works for you.
I think LengthValidator should return true for null inputs.
Comments: I've made this change in the latest commit. Let me know how it works for you.