fix: allow get_proxied_value to return original value when error#15577

Rich-Harris merged 2 commits intosveltejs:mainsveltejs/svelte:mainfrom

crookedneighbor:fix-allow-get-proxied-value-to-return-original-value-when-erroringcrookedneighbor/svelte:fix-allow-get-proxied-value-to-return-original-value-when-erroringCopy head branch name to clipboard