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Teknium
548cedb869
compress() checks both the head and tail neighbors when choosing the summary message role. When only the tail collides, the role is flipped. When BOTH roles would create consecutive same-role messages (e.g. head=assistant, tail=user), the summary is merged into the first tail message instead of inserting a standalone message that breaks role alternation and causes API 400 errors. The previous code handled head-side collision but left the tail-side uncovered — long conversations would crash mid-reply with no useful error, forcing the user to /reset and lose session history. Based on PR #1186 by @alireza78a, with improved double-collision handling (merge into tail instead of unconditional 'user' fallback). Co-authored-by: alireza78a <alireza78.crypto@gmail.com>