* bug fix: interrupt handling on NetBSD (thanks to Richard M
Kreuter)
* bug fix: saving a core corrupted callbacks on x86/x86-64
+ * bug fix: closed a loophole in metacircularity detection and
+ grounding in the PCL implementation of CLOS.
* optimization: major improvements to GC efficiency on GENCGC platforms
* optimization: faster implementation of EQUAL
* optimization: emit more efficient opcodes for some common