"Compression Method" in Build Settings?

I just noticed this settings after installing 2017.2.0b9 Beta. When was this added to Unity? And are there any guides or manual of what it does + any compatibility note?

I am currently assuming this reduces the app download size at the cost of longer uncompress time after downloading the app. The performance of the game remains the same. But it would helps if I can read the official documents from Unity.

 

Also curious about this. Does anyone know what this does exactly?

 

https://docs.unity3d.com/2017.2/Documentation/ScriptReference/BuildOptions.CompressWithLz4.html

https://docs.unity3d.com/2017.2/Documentation/ScriptReference/BuildOptions.CompressWithLz4HC.html

 

Thanks @Peter77!

 

There is NO mention of this option in the general Build Settings documentation: https://docs.unity3d.com/Manual/BuildSettings.html

And yet it is an option available here:

 

I am from the future in 2021
None or Default is Default compressionn in Android is ZIP
LZ4 is a compression method with fast compression
LZ4HC is with slow compression is for Release builds

Remember I am form the future 2021

 

I don't know what these compression methods are classified by, but it is not always true , from my testing LZ4HC(android) is super slow , unusable , LZ4HC(iOS) is working great . Therefore, it is better to test all 3 compression methods before publishing.