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20
converts the (int64_t) integer "val" to character form and moves it to
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21
the destination string "dst" followed by a terminating NUL. The
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22
result is normally a pointer to this NUL character, but if the radix
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25
If radix is -2..-36, val is taken to be SIGNED.
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If radix is 2.. 36, val is taken to be UNSIGNED.