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diff --git a/thirdparty/ryml/ext/c4core/ROADMAP.md b/thirdparty/ryml/ext/c4core/ROADMAP.md
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-# ROADMAP
-
-## New features
-
-These changes will provide new features, and client code can be kept
-unchanged.
-
-
-## API changes
-
-These changes will require client code to be updated.
-
-* [breaking] drop use of C-style sprintf() formats in error messages and
-  assertions. Change the implementation to use c4::format()
-  ```c++
-  C4_ASSERT_MSG(sz > s.size(), "sz=%zu s.size()=%zu", sz, s.size());
-  // ... the above changes to:
-  C4_ASSERT_MSG(sz > s.size(), "sz={} s.size()={}", sz, s.size());
-  ```
-
-## Implementation changes
-
-* drop calls to sprintf() in charconv.hpp.