René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] Bytes to string conversion function does not error for invalid code points","articleBody":"**Describe the bug**\n\nAccording to the language definition, \n\n\u003e `string(bytes) -\u003e string` converts a byte sequence to a UTF-8 string, errors for invalid code points. \n\nHowever, cel-java does not error for invalid code points.\n\n**To Reproduce**\n```cel\nstring(b\"\\xff\")\n```\n\n**Expected behavior**\n\nI would expect a runtime error, but the expression evaluates to `\"�\"` instead.\n\n\n**Additional context**\n\n[`bytes_to_string` calls `ByteString::toStringUtf8`](https://github.com/google/cel-java/blob/v0.9.1/runtime/src/main/java/dev/cel/runtime/CelStandardFunctions.java#L908). It should probably check `ByteString::isValidUtf8` first, and raise an error if that returns false.","author":{"url":"https://github.com/timostamm","@type":"Person","name":"timostamm"},"datePublished":"2025-06-06T13:44:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/716/cel-java/issues/716"}