get _regionCode() {
    return this.choiceValue?.toUpperCase();
  }
@typedef {import('@lion/ui/core.js').RenderOptions} RenderOptions
@typedef {import('@lion/ui/input-tel/types/types.js').RegionAndCountryCode} RegionAndCountryCode
@typedef {import('@lion/ui/input-tel/types/types.js').TemplateDataForDropdownInputTel} TemplateDataForDropdownInputTel
@typedef {{countryCode: string; regionCode: string; nameForRegion: string; nameForLocale: string}} RegionMetaList
@typedef {TemplateDataForDropdownInputTel & {data: {regionMetaList:RegionMetaList}}} TemplateDataForIntlInputTel