Intl.MessageFormat
Intlに提案されているStage1のProposal(2024/09現在)
https://github.com/tc39/proposal-intl-messageformat
ICU message-format-wg
https://github.com/unicode-org/message-format-wg
Syntax : https://github.com/unicode-org/message-format-wg/blob/main/spec/syntax.md
Formatting : https://github.com/unicode-org/message-format-wg/blob/main/spec/formatting.md
何でv2なのか : https://github.com/unicode-org/message-format-wg/blob/main/docs/why_mf_next.md
#あとで書く