Github user okram commented on the issue:
https://github.com/apache/tinkerpop/pull/495
What you have in your examples is the "bug" that is fixed in this PR:
```
gremlin> g.V(1).outE('knows').hasLabel('created')
gremlin>
```
Likewise:
```
gremlin> g.V(1).outE().hasLabel("knows").hasLabel("created")
gremlin>
```
```
gremlin> g.V(1).outE().hasLabel("knows")
==>e[7][1-knows->2]
==>e[8][1-knows->4]
gremlin> g.V(1).outE().hasLabel("knows").explain()
==>Traversal Explanation
=============================================================================================================
Original Traversal [GraphStep(vertex,[1]),
VertexStep(OUT,edge), HasStep([~label.eq(knows)])]
...
InlineFilterStrategy [O] [GraphStep(vertex,[1]),
VertexStep(OUT,[knows],edge)]
...
Final Traversal [TinkerGraphStep(vertex,[1]),
VertexStep(OUT,[knows],edge)]
gremlin>
```
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