ag and rg not listing files starting with underline, find does

Question

If I do:

touch _gandalf

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And then:

rg --files | grep gandalf | wc -l

or

ag -l -g "" | grep gandalf | wc -l

I get 0 matches as result.

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Now if I do a touch gandaf I get 1 match.

Why is that? Does files starting with underline have a similar behaviour as hidden files? Maybe is something on mac's filesystem? As mentioned on the title if I replace ag/rg for find . it works as expected.

Answer 1

In my case was my global .gitignore having a clausule to exclude files starting with underlines.

But I think is useful to keep in all this files (as mentioned on the comments):

.gitignore

.ignore

.rgignore

.agignore