The `order` method breaks finders

[bibendi]

Hi @zilkey

After updating to v3.1 to use the new order method, I've experienced problems with finders.

> Language.find(54)
=> #<Language:0x00005583fd959238 @attributes={:id=>54, :code=>"en", :title=>"English"}>

> Language.order(title: :asc)

> Language.find(54)
=> #<Language:0x00005583fd9c7a58 @attributes={:id=>192, :code=>"gd", :title=>"Gàidhlig"}>

I think there is a mutation of original records causing the breaking of record_index.

[flavorjones]

@kbrock I think I like the fix in #261 for this (which is simpler than what's introduced in #197). WDYT about merging it?

[kbrock]

Thank you for raising this issue. It is fixed by #268