fix issues#4
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May 24, 2026 22:20
…ust::String structs (ctp-rs local patch)
Root cause: C++ Converter::CThostFtdc*ToRust functions declare local
structs without setting is_null=false in the non-nullptr path.
- Debug: MSVC /RTCs stack init zero-fills -> is_null=0 (false) -> OK
- Release: no stack init -> is_null=garbage -> non-zero -> true
- Result: 824/851 classified instruments silently dropped in Release
Fix: add y.is_null = false; after XxxField y; in all 502 ToRust
functions. Matched via return XxxField{.is_null=true}; followed by
XxxField y; pattern.
Diagnosed via 4-layer log injection (EXP-E): C++ Converter -> cxx ->
Box::new -> mpsc channel. See doc/audit/release-debug-instrument-
count-discrepancy-2026-05-24.md
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