Add nowasm tag, fix nowasm inconsistency #1772
                
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I found an inconsistency between the implementation of the wasm and nowasm files.
I thought that since it seems that this feature can be disabled, it would be nice to be able to control it from a tag. So I added that too.
The reason I came about this in the first place was that it seems that there is a Rust dependency in the wasm implementation, and that conflicts with my build system. I'm sure I could figure it out if this will not be possible in the future.