/usr/share/zsh/help/getln is in zsh-common 5.3.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | getln [ -AclneE ] name ...
Read the top value from the buffer stack and put it in the shell
parameter name. Equivalent to read -zr.
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