code: func is_spacez(b []byte, i int) bool {
  	//return is_space(b, i) || is_breakz(b, i)
  	return ( // is_space:
  	b[i] == ' ' ||
  		// is_breakz:
  		b[i] == '\r' || // CR (#xD)
  		b[i] == '\n' || // LF (#xA)
  		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
  		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
  		b[i] == 0)
  }
docs: // Check if the character is a line break, space, or NUL.