TypeError: childNodes.forEach is not a function

[jscheid]

Metadata

Prettier 2.2.1, @prettier/plugin-ruby 1.5.0, default options.

Input

[
  ['先生小'], #
  ['小'],
]

[error] /tmp/foo.rb: TypeError: childNodes.forEach is not a function
[error]     at getSortedChildNodes (~/.config/yarn/global/node_modules/prettier/index.js:13931:14)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13947:22)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13963:7)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13963:7)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13963:7)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13963:7)
[error]     at decorateComment (~/.config/yarn/global/node_modules/prettier/index.js:13963:7)
[error]     at ~/.config/yarn/global/node_modules/prettier/index.js:14041:5
[error]     at Array.forEach (<anonymous>)
[error]     at Object.attach (~/.config/yarn/global/node_modules/prettier/index.js:14028:12)

[jscheid]

$ ruby --version
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]