Release 2.2.0

• Multi-threaded evaluator, executing multiple virtual machines in parallel
• Go-inspired channels for synchronizing threads
• Revamp of math libraries, addressing incompatibilities and fixing numerous bugs:
  • Fixed crash on division by zero for fx/
  • Fixed bug making exact now work also for negative numbers
  • Improved inexact when used with rationals with a very large numerator or denominator
  • Consistent interface for: random, flrandom, and fxrandom
  • Support unary argument usage for fx-, fl-, and fl/
  • Removed fixnum-width, least-fixnum and greatest-fixnum
  • New procedures make-flonum, flexponent, flsignificand, flnext, flprev, fx-width, fx-greatest, fx-least, fl-epsilon, fl-greatest, and fl-least
  • Support for many arguments for procedures flmin, flmax, fxmin, fxmax, fx+, fx-, fx*, fx/, fx=, fx<, fx>, fx<=, fx>=, fl+, fl-, fl*, fl/, fl=, fl<, fl>, fl<=, and fl>=
• New procedures in library (lispkit math util): make-nan, nan-negative?, nan-quiet?, nan-payload, and nan=?
• New procedures in library (lispkit system): physical-memory, memory-footprint, and system-uptime
• New procedure in library (lispkit port): display*
• New procedures in library (lispkit debug): stack-size, call-stack-procedures, call-stack-trace, and set-max-call-stack!
• Enabled concurrency support for library (srfi sicp)
• Included new libraries: (lispkit thread), (lispkit thread channel), (scheme flonum), (srfi 18), (srfi 144), (srfi 208), (srfi 230)
• Fixed scope of <sym> in (let <sym> ...) form, making it not accessible in the bindings
• Exceptions now include more information about the active call stack
• Included tutorial for channels as new example code
• Support comments in command-line input