Bug report: VarInt Decode bug

[cyrw]

Describe the bug
After encoding and decoding, the output result is found to be wrong.
just maybe, "VarInt Decode" step have bug.

use VarInt encode this number: 18446744072844974849
and use VarInt decode output, get this number: 18446744072844974000
output number NOT equal input number

To Reproduce

open this link:
https://gchq.github.io/CyberChef/#recipe=VarInt_Encode()VarInt_Decode()&input=MTg0NDY3NDQwNzI4NDQ5NzQ4NDk&oenc=65001

Expected behaviour
output number == input number == 18446744072844974849

Screenshots

Desktop (if relevant, please complete the following information):

• OS: Windows10
• Browser: chrome 131.0.6778.206
• CyberChef version: Version 10.19.4, Compile time: 23/10/2024 15:12:24 UTC

Additional context
nothing