Can js/BigInt be used as a map key in ClojureScript?

Fri, 13 Aug 2021 02:19:31 +0000

js/BigInt supports equality testing (= (js/BigInt 4) (js/BigInt 4)) is true so I expected to be able to use it as a key in a map (I don't know what hash function is used for the lookup)
However I see some unexpected behaviour:

(get {0 0 1 1 2 2 3 3 (js/BigInt 4) 4 5 5 7 7 8 8} (js/BigInt 4))

returns 4 as expected, but

(get {0 0 1 1 2 2 3 3 (js/BigInt 4) 4 5 5 7 7 8 8 9 9} (js/BigInt 4))

returns nil

This was tested using Firefox or Safari as the javascript engine.

Is this a bug or was I just lucky that it worked for maps with less than 10 entries?

Thanks

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Can js/BigInt be used as a map key in ClojureScript?