/usr/share/zsh/help/let is in zsh-common 5.3.1-4.
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1 2 3 4 5 6 | let arg ...
Evaluate each arg as an arithmetic expression. See the section
`Arithmetic Evaluation' in zshmisc(1) for a description of
arithmetic expressions. The exit status is 0 if the value of
the last expression is nonzero, 1 if it is zero, and 2 if an
error occurred.
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