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So, POSIX (and other C implementations) have an extension to printf()
format specifiers allowing them to specify an argument by its
position.  So, you can use:

printf("%2$s %1$s\n", "world!", "Hello");  /* prints "Hello world!\n" */

It turns out to be very handy for i18n purposes, because different
languages can have different word orders.

Alas, Lua does not support POSIX format specifier position indicators.
If you have a format string which originally meant for C's printf()
function, it is in general a bad idea to pass it straight into Lua's
string.format() function.  They are similar functions, but definitely
not compatible.