Need some help about source code

Recently I am reading the source code of graphhopper, but the code comments are not particularly clear. Is there any explanatory document about the source code, such as how we read the OSM file, the specific role of each class, etc.? In addition, I am reading a certain In the comment section, what does this “#1871” mean?

You can have a look into the technical documentation:

The “#1871” means an issue, in this case, this here:

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Thank you for your explanation, you are such a nice guy

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