Configuring Clojure’s #inst reader for a default time zone

The Clojure instant reader parses offset‑less ISO‑8601 strings as UTC instants, and there is no built‑in switch to treat those values as belonging to a particular JVM time zone. Developers who need regional timestamps must manually attach a ZoneId after parsing, which can be error‑prone and repetitive across code bases. The goal is to allow offset‑less #inst literals to be interpreted as a configurable default zone while preserving the existing UTC behavior for libraries that depend on it.

• How can the instant reader be configured per‑thread to apply a default ZoneId without altering the global *data-readers* map?
• What mechanism would let application code request zone‑specific conversion while keeping libraries seeing UTC instants?
• Are there established patterns for safely rebinding *data-readers* in a concurrent environment that avoid breaking dependent code?