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Counting characters in command output?

I thought this would give me the length of the string, but it seems to be counting words instead:

zsh% echo ${#$(echo hello)}

Is this a bug? I thought I'd need a modifier flag to treat output as an array and give me a word count, while character count would be the default.

Follow-Ups:
- Re: Counting characters in command output?
  - From: Roman Perepelitsa

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