Design a fluent builder whose return type accumulates state across chained calls, tracking which fields are set so build() is only allowed when required fields are present.
## CONTEXT A type-safe builder accumulates type information as you chain methods, so the compiler knows which fields have been set and can forbid build() until all required fields are present. In 2026 this pattern powers query builders, config builders, and form builders where each chained call refines the type. The…
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