fix color attribute in TTY and TTYTerminal to be more IOContext-like #25228
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This PR is a small bugfix to #25067, which added a
:color
attribute toTTY
(andTTYTerminal
) via aget
method that fetchesBase.have_color
. In order to act likeIOContext
, they also needgetindex
,in
, andhaskey
, which are added in this PR with tests.