Unreleased changes

Changes that have landed on the main branch but are not yet part of a tagged release. These entries are assembled into the Changelog when the next release is published.

[UNRELEASED DRAFT]

• Bump literalizer to 2026.5.28, and expose the new :json-type: and :bool-format: directive options. :json-type: routes values through a JSON-value type – e.g. serde_json::Value, nlohmann::json, com.fasterxml.jackson.databind.JsonNode, Yojson.Safe.t – on the languages that support it, so heterogeneous data renders without a heterogeneous-strategy fallback. :bool-format: selects Perl boolean variants (integer, json_pp_ref, json_pp_singleton). The new UnrepresentableEmptyDictError and UnrepresentableIntegerError raised by literalizer are surfaced as ExtensionError and honoured by :skip-if-unrepresentable:.