Issue with `Chunk.append` operation after updating to latest version

export const ApiKeyMetadataSchema = S.struct({
  name: ApiKeyNameSchema,
  createdAt: S.dateFromString(S.string),
  lastUsedAt: S.optional(S.dateFromString(S.string)).toOption(),
})
export type ApiKeyMetadata = S.To<typeof ApiKeyMetadataSchema>

const metadata: Chunk<ApiKeyMetadata> = ...

pipe(
  metadata,
  Chunk.append({name: "sdad", createdAt: ..., lastUsedAt: none<Date>()})
)

...
Type '{ name: string; createdAt: Date; lastUsedAt: Option<Date>; }' is not assignable to type '{ readonly name: string; readonly createdAt: Date; readonly lastUsedAt: Option<Date>; }'.