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Optimize JSON map key encoding #15824

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josevalim merged 1 commit into from
Sep 1, 2026
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Optimize JSON map key encoding #15824

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1 change: 1 addition & 0 deletions lib/elixir/lib/json.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -175,6 +175,7 @@ defimpl JSON.Encoder, for: Map do

# Erlang supports only numbers, binaries, and atoms as keys,
# we support anything that implements the String.Chars protocol.
@compile inline: [key: 2]
defp key(key, encoder) when is_atom(key), do: encoder.(Atom.to_string(key), encoder)
defp key(key, encoder) when is_binary(key), do: encoder.(key, encoder)
defp key(key, encoder), do: encoder.(String.Chars.to_string(key), encoder)
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