• bfac(inf) is inf, not NaN
  
• added alias names: as_int() (as_number()), is_pos(), is_neg() and doc
  
• factored out all the emulation code and moved it to Math::BigInt::CalcEmu
  
• binary/hexadecimal input was twice as slow as v1.66 due to a typo in v1.67
  
• streamlined overload for boolean context (20% faster "... if $x;")
  
• round() was missing a croak() in path testing for wrong roundmode
  
• badd(): optimize away setting of sign if it is already right
  
• bdec() is about 10% faster for negative numbers
  
• bpow(): removed some now needless tests for 0 and 1: about 30% faster
  for small numbers
  
• streamlined exponent() (parts() benefits from this, too)