Function U64

U64(value: bigint): RelishU64
Creates an unsigned 64-bit integer Relish value using JavaScript BigInt.

Use this for large integers beyond JavaScript's safe integer range (2^53-1).
Parameters
- value: bigint
  BigInt in range 0-18446744073709551615
Returns RelishU64
RelishU64 value
Throws
Error if value is out of range
Example
```
import { U64 } from '@grounds/core';

const valid = U64(BigInt('9007199254740992'));
const max = U64(BigInt('18446744073709551615'));
const zero = U64(0n);

// Runtime errors:
// U64(-1n) // Error: out of range
// U64(BigInt('18446744073709551616')) // Error: out of range
```
See
- U32 for 32-bit unsigned
- U128 for 128-bit unsigned