From type/Buf

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method write-uint64(buf8:D: uint $pos, uint64 $value, $endian = NativeEndian --> Nil)

Writes an unsigned 64-bit integer value at the given position with the given endianness.

From type/Buf

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method write-uint64(buf8: uint $pos, uint64 $value, $endian = NativeEndian --> buf8:D)

Writes an unsigned 64-bit integer value at the given position with the given endianness.