inspect -> String
自身を人間が読める形式に変換した文字列を返します。
例 a = Thread.current a.inspect # => "#<Thread:0x00007fdbaf07ddb0 run>" b = Thread.new{} b.inspect # => "#<Thread:0x00007fdbaf8f7d10@(irb):3 dead>"
a = Thread.current a.inspect # => "#<Thread:0x00007fdbaf07ddb0 run>" b = Thread.new{} b.inspect # => "#<Thread:0x00007fdbaf8f7d10@(irb):3 dead>"