Minor bugfix to prevent duplicate tags

[skiptomyliu]

"a" in ["a", "b", "c"]
false

0 in ["a", "b", "c"]
true

3 in ["a", "b", "c"]
false

"a" in {"a": "z"}
true

["a"].includes("a")
true

js is nuts to me.

[ryan-lane]

Oh javascript, you're always giving me "wat" moments.