[ruby/date] Remove references to FL_EXIVAR
This flag isn't really meant to be public, it's an implementation detail of Ruby.
And checking it before calling rb_copy_generic_ivar only save a function call.
rb_copy_generic_ivar
https://github.com/ruby/date/commit/8175252653
Added by byroot (Jean Boussier) about 1 month ago
[ruby/date] Remove references to FL_EXIVAR
This flag isn't really meant to be public, it's an implementation
detail of Ruby.
And checking it before calling
rb_copy_generic_ivaronly savea function call.
https://github.com/ruby/date/commit/8175252653