Command-line usage

Command-line parsing for Typed Main programs happens in the Wasm engine.

Example: an f32 argument

The user might type "6.283185"

In some locales, the user might type "6,283185".

Or "0x1.921fb5p+2"`.

Parsing in the Wasm engine means that all programs have a consistent interface.

Example: a handle argument

Many programs read files, but they don't literally need files.

An "input stream", that supports read would often be enough.

Programs written this way:

• Do one thing and do it well (waves to Unix)
• Don't depend on a particular filesystem view
• Don't depend on filesystem privileges
• Don't depend on a filesystem at all!

Bonus:

• No implied string comparisons! No:
  • Non-Unicode filenames
  • Unicode normalization
  • Case sensitivity
  • Windows special-case path parsing
  • Filename length limits
  • ...