git reset --soft HEAD~ modifies staged snapshot? -

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from whatever have read git reset --soft, learned doesn't modified staging area or index. in below example can see staging area/index modified result of git reset --soft. why?

mkdir test;cd test;git init; touch a; echo 1 >>a;git add a;git commit -m"1" a; echo 2 >>a;git commit -m"2" a;  git diff --cached; <no output> git reset --soft head~; git diff --cached;<see below output>  --- a/a +++ b/a @@ -1 +1,2 @@  1 +2

a commit of particular content. index indexes particular content. git diff --cached compares indexed content against named commit. when reset head, changed commit git diff --cached compares against.


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