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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160123090736.ZM14384@torch.brasslantern.com>
Date: Sat, 23 Jan 2016 09:07:36 -0800
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To: zsh-workers@zsh.org
Subject: Amusing (?) behavior of zsh/parameter specials
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This is clearly a side-effect of feature autoloading, but:

torch% typeset -m -p fun\*
typeset functrace
typeset funcsourcetrace
typeset funcstack
typeset functions
typeset funcfiletrace
torch% : $funcstack
torch% typeset -m -p fun\*
typeset functrace
typeset funcsourcetrace
typeset functions
typeset funcfiletrace
torch% () { print $functrace }
Src/zsh:21
torch% typeset -m -p fun\*    
typeset funcsourcetrace
typeset functions
typeset funcfiletrace

Note how each parameter name disappears from the typeset output after it
has been reference once.

torch% print ${(t)functrace}
array-readonly-hide-hideval-special

Probably there's nothing to be done about this, I just found it curious.
Maybe autoloaded parameters should always be hidden until they load?