The fusing of conversions between integer and word types has been improved. Basically, we have switched from only fusing operations that are adjacent in the CPS IR to fusing operations that are logically adjacent (i.e., there is a def-use dependency between them).

Added the combineWith function to the various implementations of the ORD_SET signature.

Some minor improvements to hash sets and integer hash tables.

Fixed the reporting of field-not-found errors in JSON library (the error message was garbled).

Fixed some bugs in the new JSON parser. The first byte of a UTF-8 sequence was being dropped and comments were only allowed immediately in front of values. There was also a problem with Unicode escape sequences in strings that has been fixed.

Refactored how error exceptions are used in the JSONDecode and JSONUtil modules. The new design, which follows the Basis Library pattern of the IO.Io exception, uses a single JSONError exception for all errors. The JSONError exception has two arguments: the first is an exception that details the particular kind of error and the second is the JSON value that was being processed when the error was detected. Note that this change will break code that is explicitly matching on the exceptions defined in the JSONDecode and JSONUtil modules.