Svelte 5: Increment(++) and Decrement(--) operator output is incorrect

[fznhq]

Describe the bug

in svelte 4 the compiler output it as is (count++, count--)
but in svelte 5 the output is convert to (count + (n or 1))
therefore it does something different, like this:

let plus = $state("0")
++plus // the output should be (1 as number) but it become (01 as string)

let minus = $state("0")
--minus // the output should be (-1 as number) but it become (0-1 as string)

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACnWQwQrCMBBEfyUsHipa9Fyr4HdYD5puIZhuQ7MRJPTfTVJaC-ohgcnM20nioVEaLRQXD3RrEQo4GwNb4JeJwj5RMwZtO9fLeFJa2SvDp4oq1sjCaGfFUaws3xizCvYVrA-T2Sr648bVOJKsOhKKZI8tEmdr4ZPLcexmk6JD2JbpGr_SqSfPp3i5-1ySyrtjDlhHUiv5OPq5bUiPCLIQPvYlckz_JufmkawxgKl6SYbPartaNQprKLh3OFyHNz4tUkFnAQAA

Logs

No response

System Info

svelte@5.0.0-next.123

Severity

annoyance