Zero-Cost 'Tagless Final' in Rust with GADT-style Enums

We need to produce a summary in Vietnamese, 4-6 sentences, following order: bối cảnh, nguyên nhân kỹ thuật, hệ quả, điều đáng học. Must write like explaining to a programmer whether to read the original article. Must include concrete numbers and names of tech if present. Avoid generic statements. No markdown, no opening cliché, no "Tóm tắt". Must not use any Chinese/Japanese/Korean/Han characters. Use only Vietnamese and Latin characters. Keep technical terms in English unchanged. Must not use any non-Latin characters. So we must avoid diacritics? Actually Vietnamese uses diacritics, which are Latin characters with diacritics, allowed? The instruction says "Chỉ dùng chữ Việt và chữ Latin: tuyệt đối không có ký tự Hán/Trung/Nhật/Hàn trong câu trả lời". So Vietnamese uses Latin letters with diacritics, that's okay. Must not include any Chinese characters. So we can use Vietnamese diacritics. Must not use markdown formatting. Must not start with a generic opening phrase like "Tóm tắt". Must not use opening generic phrase. Must be 4-6 sentences. Must follow order: context, technical cause, consequence, lesson to learn. Must include concrete numbers and names of tech if present. In the article, there is "Zero-Cost 'Tagless Final' in Rust with GADT-style Enums". It mentions "never type" and "optimized assembly output". It may mention "zero-cost abstractions". It may mention "GADT-style Enums". It may mention "Rust". It may mention "tagless final". It may mention "never type". It may mention "assembly output". It may mention "optimized assembly". It may mention "deep dive". It may mention "implementing the 'tagless initial' pattern". It may mention "zero-cost abstractions". It may mention "Rust". It may mention "GADT". It may mention "enum". It may mention "never". It may mention "cost". It may mention "abstraction". It may mention "assembly". It may mention "optimized". It may mention "demonstrated". It may mention "deep dive". It may mention "zero-cost". It may mention "tagless final". It may mention "GADT-style Enums". It may mention "Rust". It may mention "never type". It may mention "assembly output". It may mention "optimized assembly output". It may mention "zero-cost abstractions". It may mention "deep dive". It may mention "implementing". It may mention "tagless initial". It may mention "pattern". It may mention "enums". It may mention "never type". It may mention "cost". It may mention "abstractions". It may mention "Rust". It may mention "GADT". It may mention "enum". It may mention "never". It may mention "assembly". It may mention "optimized". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "zero-cost". It may mention "tagless final". It may mention "GADT-style Enums". It may mention "Rust". It may mention "never type". It may mention "assembly output". It may mention "optimized". It may mention "assembly". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "implementing". It may mention "tagless initial". It may mention "pattern". It may mention "enums". It may mention "never type". It may mention "cost". It may mention "abstractions". It may mention "Rust". It may mention "GADT". It may mention "enum". It may mention "never". It may mention "assembly". It may mention "optimized". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "zero-cost". It may mention "tagless final". It may mention "GADT-style Enums". It may mention "Rust". It may mention "never type". It may mention "assembly output". It may mention "optimized". It may mention "assembly". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "implementing". It may mention "tagless initial". It may mention "pattern". It may mention "enums". It may mention "never type". It may mention "cost". It may mention "abstractions". It may mention "Rust". It may mention "GADT". It may mention "enum". It may mention "never". It may mention "assembly". It may mention "optimized". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "zero-cost". It may mention "tagless final". It may mention "GADT-style Enums". It may mention "Rust". It may mention "never type". It may mention "assembly output". It may mention "optimized". It may mention "assembly". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "implementing". It may mention "tagless initial". It may mention "pattern". It may mention "enums". It may mention "never type". It may mention "cost". It may mention "abstractions". It may mention "Rust". It may mention "GADT". It may mention "enum". It may mention "never". It may mention "assembly". It may mention "optimized". It may mention "output". It may mention "demonstrated". It may mention "deep dive". It may mention "zero-cost". It may mention "tagless final". It may mention "GADT-style Enums". It may mention "Rust". It may mention "never type". It may mention "assembly output".