BigInt.this
- this(T n)
 - this(string str)
 - this(const(ubyte)* input, size_t length, Base base)
 - this(RandomNumberGenerator rng, size_t bits, bool set_high_bit)
 - this(Sign s, size_t size)
 - this(BigInt other)
 - this(Vector!(ubyte, ALLOC) payload, Sign sign)
 - this(RefCounted!(Vector!(ubyte, ALLOC), ALLOC) payload, Sign sign)
 - this(SecureVector!word reg, Sign sign)
 
 
		botan math bigint bigint BigInt 
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Create BigInt from a string. If the string starts with 0x the rest of the string will be interpreted as hexadecimal digits. Otherwise, it will be interpreted as a decimal number.