spec_helper: Restore case-insensitive matching in find_spdx #568
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The previous case-insensitive matching was removed in e5f46fa (#418). That commit was designed to allow case-sensitive matching as discussed in #72. But while I'm in favor of case-sensitive keys in spdx_list, the case-sensitive match breaks script/check-approval which downcases its argument since it was added in 8e56bb8 (#318).
There are more notes on SPDX's plans for case sensitivity in spdx/spdx-spec#63, so we should see a clearer policy there soon. I'm arguing for case-sensitive display with optional case-insensitive matching. I am optimistic that the SPDX will at least agree not to register short IDs that only differ by case, which is all we need to make this
case-insensitive match safe here.