// Tagged template: runtime validation, supports interpolation
const seq = dna`ATCGATCG`;
const composed = dna`${adapter}ATCG${adapter}`;
// Literal: compile-time + runtime validation (requires string literal)
const safe = dna.literal("ATCG"); // ✅
const bad = dna.literal("ATXG"); // ❌ Compile error
Standard DNA sequence constructor.