451d280815
We've been trying to support \u0000 in JSON values since commit 78ed8e03c67d7333, and have introduced increasingly worse hacks to try to make it work, such as commit 0ad1a816320a2b53. However, it fundamentally can't work in the way envisioned, because the stored representation looks the same as for \\u0000 which is not the same thing at all. It's also entirely bogus to output \u0000 when de-escaped output is called for. The right way to do this would be to store an actual 0x00 byte, and then throw error only if asked to produce de-escaped textual output. However, getting to that point seems likely to take considerable work and may well never be practical in the 9.4.x series. To preserve our options for better behavior while getting rid of the nasty side-effects of 0ad1a816320a2b53, revert that commit in toto and instead throw error if \u0000 is used in a context where it needs to be de-escaped. (These are the same contexts where non-ASCII Unicode escapes throw error if the database encoding isn't UTF8, so this behavior is by no means without precedent.) In passing, make both the \u0000 case and the non-ASCII Unicode case report ERRCODE_UNTRANSLATABLE_CHARACTER / "unsupported Unicode escape sequence" rather than claiming there's something wrong with the input syntax. Back-patch to 9.4, where we have to do something because 0ad1a816320a2b53 broke things for many cases having nothing to do with \u0000. 9.3 also has bogus behavior, but only for that specific escape value, so given the lack of field complaints it seems better to leave 9.3 alone.
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