* fix: disallow null seed for gen_rng

* docs: add changelog

* fix: remove VNull from return types

* chore: reorder imports

* fix: update URL in help

* docs: add changelog

* Disallow duplicate key

* changelog

* オブジェクトリテラル内で省略記法に対応

* fix: isStaticが真ならショートハンド構文を無効化

* fix: キーがIdentifierなときにのみ使用可能にする

* fix lint

…した或いは何も指定しなかった場合、`seed & 255`を内部的に`seed`としてしまう問題を修正。 (#1019)

* * Fixed ChaCha20 could only generate 256 different seeds for number seed values.
* Added `chacha20NumberSeedLegacyBehaviour` to restore the legacy behaviour (`false` by default)

* Added test for new ChaCha20 seed generator behaviour.

* Lint fixes

* Added `chacha20-seed-unexpected-rounding-fix.md`.

* Updated `chacha20-seed-unexpected-rounding-fix.md`

* Update unreleased/chacha20-seed-unexpected-rounding-fix.md

Co-authored-by: Take-John <takejohn@takejohn.jp>

* Renamed `chacha20NumberSeedLegacyBehaviour` to `chacha20_number_seed_legacy_behavior`

* Update unreleased/chacha20-seed-unexpected-rounding-fix.md

Co-authored-by: Take-John <takejohn@takejohn.jp>

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Co-authored-by: Take-John <takejohn@takejohn.jp>