don't blow the stack during mark except in pathological cases (should still implement D/S/W for those cases)
don't blow the stack during mark except in pathological cases
(should still implement D/S/W for those cases)

holmescn/chibi-scheme,norton/chibi-scheme,holmescn/chibi-scheme,norton/chibi-scheme,holmescn/chibi-scheme,holmescn/chibi-scheme,norton/chibi-scheme,norton/chibi-scheme,norton/chibi-scheme,holmescn/chibi-scheme,norton/chibi-scheme