Fable 5.8.0 released!

NewsBot · 11 July 2026 21:18

Fable 5.8.0 has been released.

Features

(beam) Implement Async.StartChild in fable_async runtime (#4760) (eb2ad9a4)

Bug Fixes

(beam) Order discriminated union comparison by declaration order (#4761) (3597a582)

(beam) Preserve function-value identity for PhysicalEquality (#4762) (727673f3)

(js/ts) Don’t drop unsupported jsOptions statements when inlining as POJO (#4754) (4cbc44fc)

(js/ts) Async cancellation propagation and continuation double-resolve (#4746) (c78a9a8e)

(js/ts) Date arithmetic: PM parsing, AddMonths day clamp, AddYears offset (#4744) (be0558eb)

(js/ts) Int64 non-decimal parsing and BitConverter .NET mismatches (#4748) (2704d9c5)

(python) Propagate [] return value as process exit code (#4763) (a8d9bf5f)

Performance Improvements

(python) Avoid conversion-dunder hop in numeric fast paths (#4756) (838eda53)

(python) Speed up array aggregates and generic storage in fable-library-core (#4755) (e40a7dc4)

[View changes on Github](Comparing main...d6ae6bd3790b57b31941a118cd · fable-compiler/Fable · GitHub…

Link: Release 5.8.0 · fable-compiler/Fable · GitHub