ruby 1.8.6 (2010-09-02 patchlevel 420) [powerpc-darwin9.8.0] [1.8.6,pth] (ppc-mac-mini) 153W 3[BUG] 2[SIGABRT] failed(test.rb) failed(method-list) failed(make)

COMMIT Split Numeric#step's rb_bug into #781 and #3945.
COMMIT clean arround sprintf.