const math/big.digits

5 uses

	math/big (current package)
		natconv.go#L18: const digits = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
		natconv.go#L294: 				s[i] = digits[w&mask]
		natconv.go#L308: 				s[i] = digits[w&mask]
		natconv.go#L319: 			s[i] = digits[w&mask]
		natconv.go#L422: 				s[i] = digits[r%b]

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