Runners are used internally.

This reverts commit 40c8aa70.

simplify Class#descendants using singleton_class method

correctly handle order calls after a reorder

Infer currency negative format from positive one.

Remove rescue block to require psych gem

using the active support logger

No need of html_safe here

When a locale file sets the format of the positive
currency value as '%n %u', the default negative
currency format should be '-%n %u'.

tag helper always return a html safe string and concat two html safe
strings always return a html safe string

create_fixtures should accept symbol keys for custom table -> class mappings. Fixes an unintended regression.

Fix GH #4285. Remove options when we record calling creat_table

setup_fixture_accessors should accept symbols for table names. Fixes an unintended (and untested) regression.

Polymorphic with optimistic lock and counter cache should be destroyed

use correct variant of checking whether class is a singleton

Clean up routes inclusion and add some comments for the next soul that decides to adventure on this code.