How can I use `get` with a subtype of a Dict key?

General Usage
2

You are missing the third argument to get

help?> get
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  get(collection, key, default)

  Return the value stored for the given key, or the given default value if no mapping for the key is present.

  │ Julia 1.7
  │
  │  For tuples and numbers, this function requires at least Julia 1.7.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> d = Dict("a"=>1, "b"=>2);

  julia> get(d, "a", 3)
  1

  julia> get(d, "c", 3)
  3