unexpected output if search string is lowercase and file uses snake case

[cout]

If my document contains:

test_case
Test_Case

and I type:

:%S/test_case/foo_bar

then I get:

foo_bar
Test_Case

but if I type:

:%S/Test_Case/Foo_Bar/g

then I get:

foo_bar
Foo_Bar

If this is the intended behavior, then please document it. I read through the readme multiple times but perhaps I missed the discussion on behavior of capitalization.

[milessabin]

I'm also seeing this, but in general, not just with snake case: if my search string is all lowercase than only all lowercase matches are found; if my search string is capitalized then it will match both all lowercase occurrences and occurrences with the exact capitalization of the search string.

I normally have ignorecase and smartcase enabled, but I've tried with both disabled and I see the same result.

Any clues on how to diagnose this would be very much appreciated.

[milessabin]

Ahh ... I see my mistake. I was trying to map hnil and HNil to cnil and CNil respectively, and it seems that Subvert won't accept adjacent capitals as a form of camel case.