Slot characteristic inheritance

Hi,

Sorry if this question has already been discussed here but I am
a newbie in using eieio. Well I read in info documentation :
"Every slot in parent
     is replicated in the new class.  If two parents share the same
     slot name, the parent which appears in the list first sets the
     attributes for that slot.  If a slot in the new class' slot list
     matches a parent, then the new specifications for the child class
     override that of the parent."

Well it does not seem to be the case for the custom attribute
for instance. Indeed when a read teh code, I saw that 
init, type (and maybe default) really override settings for
parent class but not custom.

Why ? Is it something that has to be done in the code or should
it absolutely not be done if it would disturbe the widget
definition process ?

Bests

Pierre


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