src/vs/editor/common/model/bracketPairsTextModelPart/bracketPairsTree/ast.ts/ImmutableArrayListAstNode/toMutable
class ImmutableArrayListAstNode:	override toMutable(): ListAstNode {
		return new ArrayListAstNode(this.length, this.listHeight, [...this.children], this.missingOpeningBracketIds);
	}