Fix LDAP filter escaping (RFC4515) #224
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- Correctly escape NUL byte (\0 -> \00)
- Replace hardcoded "\00" (three chars) with actual NUL
- Ensure proper hex codes:
\ -> \5c
( -> \28
) -> \29
* -> \2a
NUL -> \00
Previously, "\00" was treated as "\" (0x5c), so NULs were never escaped.
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Previously, "\00" was treated as "" (0x5c), so NULs were never escaped.