[PATCH] Perform cumulative typesetting also on parameters with no value

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Typesetting multiple times the same parameter with different flags but
without changing its type should be cumulative. This currently fails for
parameters declared with no value when TYPESET_TO_UNSET is enabled.

% setopt TYPESET_TO_UNSET
% typeset -u var1=foo var2
% typeset -p var1 var2
typeset -u var1=foo
typeset -u var2
% typeset -x var1 var2
% typeset -p var1 var2
export -u var1=foo
export var2

The last line should include -u, like the previous one.

- Perform cumulative typesetting also on parameters with no value
<https://github.com/zsh-users/zsh/compare/master...paltherr:zsh:typeset-use-pm-if-declared>

Philippe

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<div dir=3D"ltr"><div>Typesetting multiple times the same parameter with di=
fferent flags but without changing its type should be cumulative. This curr=
ently fails for parameters declared with no value when=C2=A0TYPESET_TO_UNSE=
T is enabled.</div><div><br></div><font face=3D"monospace">% setopt TYPESET=
_TO_UNSET<br>% typeset -u var1=3Dfoo var2<br>% typeset -p var1 var2<br>type=
set -u var1=3Dfoo<br>typeset -u var2<br>% typeset -x var1 var2<br>% typeset=
 -p var1 var2<br></font><div><font face=3D"monospace">export -u var1=3Dfoo<=
br>export var2</font></div><div><br></div><div>The last line should include=
 -u, like the previous one.</div><div><br></div><div>-=C2=A0<a href=3D"http=
s://github.com/zsh-users/zsh/compare/master...paltherr:zsh:typeset-use-pm-i=
f-declared">Perform cumulative typesetting also on parameters with no value=
</a></div><div><br></div><div>Philippe</div><div><br></div></div>

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