Leading zero's are cut out from the decompression

[Murat Karagoez]

Hello,

first and foremost a big thank you all for providing the GS1DigitalLinkToolkit.js. With that I could develop a counterpart for Java for our own internal usage here at GoodsTag.

We are currently implementing our own solution for the GS1 DL Resolver and everything is working fine so far. But there is a issue with the decompression and leading zeros in the function handleDecodings

This is the line https://github.com/gs1/GS1_DigitalLink_Resolver_CE/blob/master/digitallink_toolkit_server/src/GS1DigitalLinkToolkit.js#L7193

Example: 

Plain URL / Compressed / Decompressed

1)

https://test.de/8004/081938502111111

https://test.de/gAQPEqFy0_Phw

https://test.de/8004/81938502111111

2)

https://test.de/01/12301027231800/21/000000000012339281

https://test.de/ARZgHLeQcEIkAAAAABeJCi

https://test.de/01/12301027231800/21/12339281

I attached a Minimal, Reproducible Example. 

Currently we solved it by using the value of numChars for padding the zeros. The JavaScript equivalent would look like this

let s = String(BigInt('0b' + rbv)).padStart(numChars, '0');

However I am not sure if this will produce side-effects. So could you double check if that is O.K?

Best Regards

Murat Karagöz