Why does command substitution change the behaviour of a name referenced parameter of a function?

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Peter Schneider
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Why does command substitution change the behaviour of a name referenced parameter of a function?
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Thanks to all those great people for their contributions!

(stackoverflow.com/users/7277667/ding-liu)Ding Liu
(stackoverflow.com/posts/79238820/revisions)glenn jackman
(stackoverflow.com/users/1745001/ed-morton)Ed Morton
(stackoverflow.com/users/2125671/philippe)Philippe
A special thanks goes out to the (stackoverflow.com/questions/79238799/why-does-command-substitution-change-the-behaviour-of-a-name-referenced-paramete)Stackexchange community

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