some suggestion

[ahdung]

vscode edition, suggestion:

• when use the radix contains letter, provide a upper/lowercases switch way, for example: 1:0:16/U or /L

• any parameter should be optional, and use special prefix to detect them, not the ordinal, for example:

  • start not use prefix or use space if it not first;
  • operator and step still keep, actually the operator should be step's prefix;
  • digit still use ":" or "#";
  • radix should use "_" or "@" or other, so follow statment all accepted:

@16
@16/U
3@16/U
3+2@16/U
:2
@16 +3
@16/U 2
@16:2+2 3