Incrementing/decrementing `BigInt` `$state`s throws an error

[Ocean-OS]

Describe the bug

When compiling foo++ and bar-- statements (assuming that foo and bar are $states), Svelte assumes that foo and bar are numbers, and compiles it to $.update(foo) and $.update(bar, -1). However, if foo or bar are BigInts, this causes an error because numbers and BigInts cannot be mixed together without type conversion.
I have a PR ready for this.

Reproduction

REPL

Logs

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System Info

N/A

Severity

annoyance