Why ~a, ~s, and ~v?

[primer]

I'm reading the documentation about formatted output where it says:

~a or ~A displays the next argument
~s or ~S writes the next argument
~v or ~V prints the next argument

I can't help thinking these would be more intuitive if they were spelled ~d, ~w, and ~p.

Perhaps I can remember them better if someone could explain where the letters come from.  Can anyone explain?

[Sorawee Porncharoenwase]

I had this question too. It looks like they are inherited from Scheme.

~a = any

~s = s-expression

See http://wiki.call-cc.org/eggref/5/format#documentation.

There's no ~v. IIUC, there's no `print` in Scheme.

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[Sam Tobin-Hochstadt]

That page actually suggests they're inherited from Common Lisp, which
seems very likely (and probably from some other Lisp before that).

Sam

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[Robby Findler]

v is for "value" I believe. 

Robby

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