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Update RELEASE_NOTES.md for version 4.15.5

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Added new features and bug fixes in version 4.15.5, including RCF API, sequence functions, benchmark export functionality, and migration to GitHub Actions.
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Nikolaj Bjorner 2026-01-19 15:12:06 -08:00 • committed by GitHub
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@ -9,6 +9,23 @@ Version 4.next
Version 4.15.5
==============
- Add RCF (Real Closed Field) API to TypeScript bindings, achieving feature parity with Python, Java, C++, and C# implementations.
The API includes 38 functions for exact real arithmetic with support for π, e, algebraic roots, and infinitesimals.
https://github.com/Z3Prover/z3/pull/8225
- Add sequence higher-order functions (map, fold) to Java, C#, and TypeScript APIs. Functions include SeqMap, SeqMapi, SeqFoldl, and SeqFoldli
for functional programming patterns over sequences.
- Java API: https://github.com/Z3Prover/z3/pull/8226
- C# API: https://github.com/Z3Prover/z3/pull/8227
- TypeScript API included in https://github.com/Z3Prover/z3/pull/8228
- Add benchmark export functionality to C# and TypeScript APIs for exporting solver problems as SMTLIB2 benchmarks.
https://github.com/Z3Prover/z3/pull/8228
- Fix UNKNOWN bug in search tree with inconsistent end state during nonchronological backjumping. The fix ensures all node closing
occurs in backtrack to maintain consistency between search tree and batch manager state. Thanks to Ilana Shapiro.
https://github.com/Z3Prover/z3/pull/8214
- Fix segmentation fault in dioph_eq.cpp when processing UFNIRA problems without explicit set-logic declarations. Added bounds checks
before accessing empty column vectors. https://github.com/Z3Prover/z3/pull/8218, fixes #8208
- Migrate build and release infrastructure from Azure Pipelines to GitHub Actions, including CI workflows, nightly builds, and release packaging.
- Bug fixes including #8195
Version 4.15.4
==============