Incorrectly comparing a counted value with multiple predicates

We use a composition of two predicates inside(-1,1).and(lt(-1)) to filter numbers that are greater than -1 and less -1. Obviously, no values satisfy this condition. Therefore, we expect Tinkergraph returns an empty set. However, a vertex is returned.

gremlin> :> g.V().where(__.in('knows').count().is(inside(-1,1).and(lt(-1))))
==>v[0] 

The graph of this example is as following.

Vertex bob = g.addV("person").property("name", "Bob").next(); // v[0]
Vertex alice = g.addV("person").property("name", "Alice").next(); // v[1]
Edge edge1 = g.addE("knows").from(bob).to(alice).next();