• The standard library is now packed into a module called Stdlib, which is open by default. This makes it easier to add new modules to the standard library without clashing with user-defined modules.

• The modules Seq (functional iterators) and Float (floating-point operations) were added to the standard library.

• Improvements to several error and warning messages printed by the compiler make them easier to understand.

• Many improvements to flambda. In particular, compilation times are reduced, as well as the size of the generated .cmx files when using the -Oclassic optimisation level.

• The GC should handle the accumulation of custom blocks in the minor heap better; this solves some memory-usage issues observed by code which allocates a lot of small custom blocks, typically small bigarrays.

• Removed the dependency on curses/terminfo/termcap.

• The SpaceTime profiler now works under Windows.

• The HTML manual was restyled and looks nicer.

See also: detailed list of changes