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value_len

๊ฐ’
get_numberlen((unsigned long)value, 10) (์Œ์ˆ˜ ๊ณ ๋ ค ์•ˆํ•จ) precision ์ด 0, value ๊ฐ€ 0 ์ด๋ฉด value_len = 0