Some minor improvements in the REPL’s pretty printing.

The system/cmb-make script now runs with the CM_VERBOSE environment variable set to false by default (use the -verbose option for the old behavior). It also now sets the PATH environment variable to include the directory where the sml command lives when it is given as an argument to cmb-make.

Complete rewrite of the mechanisms used to implement conversions between strings and reals. As part of this rewrite, we implemented the support for the StringCvt.EXACT formatting mode and implemented the missing Real.toDecimal/fromDecimal functions. The real-string conversions is based on the Ryu library and associated PLDI paper by Ulf Adams.

Added missing implementation of Real64.nextAfter function.

Added Unsafe.Real64 structure that implements bit casts between double-precision reals and 64-bit words.

Rewrote the JSON parsers to work directly on the input source (instead of using a ML-ulex lexer. This change fixes https://github.com/smlnj/legacy/issues/284[Issue #284 (ML-ULex’s memoization causes massive performance penalties for JSON parsing). For the data.json file mentioned in the issue, parsing is about eight times faster, while the speedup is even greater for the huge.json file.

Added the JSONDecode structure to the JSON library. This module implements a set of combinators (inspired by the Elm JSON.Decode module) for decoding JSON values.

Added insertWith, insertWithi, and findAndRemove operations to the HASH_TABLE and MONO_HASH_TABLE interfaces (and corresponding implementations).

Fixed a bug in Random.randReal on 32-bit systems.

Fixed the error checking and documentation for the subArray function in the DynamicArray structure and DynamicArrayFn functor.

Fixes to the subArray and truncate functions in the dynamic array implementation (both structure DynamicArray and functor DynamicArrayFn).

Add EditDistance module to utility library.

Reworked the UTF8 structure to impose stricter validation of the encodings. Added the Invalid exception for when an invalid encoding is encountered and replaced uses of the Domain exception with Invalid. Also added the size' function for getting the number of UTF-8 characters in a substring.

Added modules for the representation of booleans, integers, and words as hash-consed values to the HashCons library.