Abstract pexpect.SpawnBase has no send/sendline/write/writelines stubs

The actual implementation of pexpect.SpawnBase does not contain these functions but it is an abstract class and all children have these write methods.

Since almost all interesting pexpect code does some form of writing it is impractical to use SpawnBase as an annotation. The only viable solution seem to be annotating with PopenSpawn or maybe an union if you actually want to be generic?

Perhaps it would be acceptable to add these stubs to SpawnBase despite what is written in the implementation.

typeshed 内の SpawnBase スタブを見つけ、send、sendline、write、writelines を定義している子スタブと比較します。関連する typing テストを確認するか、リポジトリの型チェックテストを実行して、SpawnBase のアノテーションが既存の実装を壊すことなくこれらのメソッドを公開していることを確認します。