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Feature #15627

Appearance of custom singleton classes

Added by sawa (Tsuyoshi Sawada) over 1 year ago. Updated 8 months ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:91640]

Description

When I have a singleton class AClass of an instance a of a custom class A,

class A; end
a = A.new
AClass = a.singleton_class

i) even though the singleton class of nil, false, and true are referred to by their assigned constant names, the singleton class AClass of a is not:

nil.singleton_class #=> NilClass
false.singleton_class #=> FalseClass
true.singleton_class #=> TrueClass
a.singleton_class #=> #<Class:#<A:0x00007fda832a7eb0>>

ii) even though the singleton class of nil, false, and true appear as their class, the singleton class AClass of a does not:

nil.class #=> NilClass
false.class #=> FalseClass
true.class #=> TrueClass
a.class #=> A

This contrast between nil, false, and true on the one hand and a on the other is confusing. I am actually not sure if this is intended behaviour It may be related to

I expect AClass to behave the same as with NilClass, FalseClass, and TrueClass. I expect:

a.singleton_class #=> AClass
a.class #=> AClass

If the current behaviour is intended, I would like this to become a feature request.

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