Closes #33

changelog.md

@@ -34,6 +34,19 @@ existing Git tag; subsequent changes are listed as unreleased.
 
 #### Fixed
 
+- Reject all `SIG_VALTYPE_` declarations with a source-located
+  `UnsupportedSignalType` error instead of silently decoding their payload as
+  integers. Both parser APIs reject the unsupported operator, including type 0;
+  the diagnostic API publishes no partial database. Namespace symbol listings
+  remain quiet. No permissive mode is introduced.
+- Display parser warnings and errors in the demo, and stop before building or
+  decoding when parsing fails. Add parser and pipeline regressions for float32,
+  float64, source locations, declaration order, and unchanged integer decoding.
+  Verify Release and ASan/UBSan builds with the optional Qt adapter: 2,420 core
+  checks, seven model checks, and the qmake tree test pass in each build. One
+  named-locale case skips; leak checking remains disabled due to ptrace.
+  Build the demo and verify error exits, visible warnings, and integer input.
+
 - Replace recursive regular-expression matching for `SG_` statements with an
   iterative field scanner. Long unit strings no longer overflow the stack.
 - Parse signal physical values directly with locale-independent `from_chars`,