Multilingual value resolution for attribute data.

AttrEngine stores localized values as JSONB maps keyed by locale:

%{"en" => "Welcome", "el" => "Καλωσήρθατε", "de" => "Willkommen"}

This module resolves those maps to a single value for the target locale, with configurable fallback behaviour.

Modes

• :fallback (default) — tries target locale, then default locale, then first available
• :strict — returns :__missing__ if target locale not found (for skip-block behaviour)

Deep resolution

resolve_deep/3 recursively walks JSONB trees, resolving all localized maps at any nesting depth. Correctly skips rich content maps (EditorJS, Lexical) that happen to have locale-like keys.

Usage

data = %{"title" => %{"en" => "Hello", "el" => "Γεια"}, "count" => 42}

AttrEngine.Locale.resolve_deep(data, "el", default_locale: "en")
#=> %{"title" => "Γεια", "count" => 42}

AttrEngine.Locale.resolve_deep(data, "de", default_locale: "en")
#=> %{"title" => "Hello", "count" => 42}

AttrEngine.Locale.resolve_deep(data, "de", mode: :strict)
#=> %{"title" => :__missing__, "count" => 42}