[lukaszsamson]

Found with SpecLint on elixir 1.20.4

lib/cldr/locale.ex:2827: warning: Cldr.Locale.aliases/2: inferred return includes %Cldr.LanguageTag{
  ... (69 lines omitted) ...
    @spec aliases(locale_name() | String.t(), atom()) ::
  String.t() | [String.t()] | Cldr.LanguageTag.t() | nil
    inferred: (atom(), :region) -> dynamic(nil or binary() or non_empty_list(binary()))
    inferred: (term(), :language or :region or :script or :subdivision or :variant or :zone) -> dynamic(
  %Cldr.LanguageTag{
    language: binary(),
    language_subtags: empty_list(),
    script: nil,
    territory: nil,
    language_variants: empty_list(),
    locale: empty_map(),
    transform: empty_map(),
    extensions: empty_map(),
    private_use: list(binary()),
    requested_locale_name: binary(),
    canonical_locale_name: nil,
    cldr_locale_name: nil,
    rbnf_locale_name: nil,
    gettext_locale_name: nil,
    backend: nil
    ... (56 more lines omitted) ...
lib/cldr/timezone.ex:80: error: Cldr.Timezone.timezones_by_territory/0: inferred return %{
  ... (3213 lines omitted) ...
    @spec timezones_by_territory() :: %{
  SV: [timezone(), ...],
  EC: [timezone(), ...],
  SE: [timezone(), ...],
  GF: [timezone(), ...],
  TK: [timezone(), ...],
  CV: [timezone(), ...],
  PH: [timezone(), ...],
  MW: [timezone(), ...],
  TT: [timezone(), ...],
  NI: [timezone(), ...],
  LB: [timezone(), ...],
  LV: [timezone(), ...],
  GT: [timezone(), ...],
  JP: [timezone(), ...],
  NU: [timezone(), ...],
  LR: [timezone(), ...],
  LA: [timezone(), ...],
  SZ: [timezone(), ...],
  GN: [timezone(), ...],
    ... (1960 more lines omitted) ...
lib/cldr.ex:941: error: Cldr.requested_locale_names/1: no inferred clause accepts the arguments of this spec clause
    @spec requested_locale_names(backend()) :: [Cldr.Locale.locale_name(), ...] | []
    inferred: (%{..., requested_locale_names: term()}) -> dynamic()
ex_cldr 2.47.5: 180 spec clauses, 3 finding(s), 0 skipped

Findings are from the Hex package (ex_cldr 2.47.5); the repo itself needs CLDR_PRODUCTION data to compile, so the changes were not re-linted locally. Cldr.Locale.aliases("nlsx", :subdivision) #=> :SX, so atom() is added to the return spec. Entries in timezones_by_territory/0 carry a short_zone key, so the timezone type now has optional(:short_zone) (optional because timezones/0 values lack it). Cldr.requested_locale_names/1 now calls backend.requested_locale_names() with parens.