ANSI Common Lisp format control string engine for ExLisp. Supports:

• ~A, ~S, ~C, ~W (Aesthetic, Standard, Character, Write)
• ~D, ~B, ~O, ~X, ~R (Decimal, Binary, Octal, Hex, Radix/English/Roman)
• ~P (Pluralization: s, ies, with modifiers)
• ~F, ~E, ~G, ~$ (Floating point, Exponential, Monetary)
• ~%, ~&, ~|, ~~ (Newlines, Fresh-line, Page, Tilde)
• ~* (Argument navigation: forward, backward, absolute)
• ~? (Indirection / nested format)
• ~[ ... ~] (Conditional selection: index, boolean, truthy)
• ~{ ... ~} (Iteration: list, sublists, remaining args, max iterations)
• ~^ (Escape / termination check)
• ~( ... ~) (Case conversion: downcase, capitalize, upcase)