Re: [boost] Road to low-quality-code is paved with good intentions of dropping dependencies

Daniel James wrote:

I'm certainly not having a git submodule just for one header. They're way too expensive.

In what way are git submodules expensive? (Note: this is not an argument in favor of making a git submodule for hash_fwd.hpp. It is a genuine question that will help my evaluation of the various tradeoffs.)