So for Sequel 5 this syntax was deprecated:
```
:a
:a__b
:a__b__c
```
The problem I'm having is that we would pass around these qualified
identifier symbols and modify them. For example:
```
foreign_key [column], :"#{table}_persistent", :on_delete => :cascade
```
With the old syntax I could basically ignore whether it was qualified or
not and just add `_persistent`, with the new identifiers there doesn't
appear to be an easy way to handle this:
```
[30] pry(main)> Sequel[:a]
=> #<Sequel::SQL::Identifier @value=>"a">
[31] pry(main)> Sequel[:a][:b]
=> #<Sequel::SQL::QualifiedIdentifier @table=>"a", @column=>:b>
[32] pry(main)> Sequel[:a][:b][:c]
=> #<Sequel::SQL::QualifiedIdentifier
@table=>#<Sequel::SQL::QualifiedIdentifier @table=>"a", @column=>:b>,
@column=>:c>
```
The interface for Identifier and QualifiedIdentifier doesn't match, and
there doesn't seem to be a way to modify an existing identifier, so to
create a modified identifier I'd need to do something like this:
```
old = Sequel[:a][:b]
new = Sequel[old.table]["#{old.column}_persistent"]
```
Which is complicated further if it's double qualified or not qualified.
To be honest I'm not sure what the best solution here is, so I was
wondering if there was a better way to do this.
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