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Three new host primitives in eval.sx: _int_to_hex_lower n -> string of hex digits (lowercase) _int_to_hex_upper n -> string of hex digits (uppercase) _int_to_octal n -> string of octal digits Each builds the digit string by repeated floor(n / base) + mod, prepending the digit at each step. Negative numbers prefix '-' so the output round-trips through int_of_string with a sign. Printf walker now fans out: %d, %i, %u -> _string_of_int %f -> _string_of_float %x -> _int_to_hex_lower %X -> _int_to_hex_upper %o -> _int_to_octal %s, %c, %b -> existing handling Printf.sprintf '%x' 255 = 'ff' Printf.sprintf '%X' 4096 = '1000' Printf.sprintf '%o' 8 = '10' Printf.sprintf '%x %X %o' 255 4096 8 = 'ff 1000 10'