Extension to patch AS::TaggedLogging for compatibility

[leehambley]

ActiveSupport::TaggedLogging uses Thread.current[]= to track log tags. This Thread.current[]= is however Fiber local variable (since Ruby 2.0)

Compare:

• https://ruby-doc.org/core-2.0.0/Thread.html#method-i-5B-5D

  Attribute Reference—Returns the value of a fiber-local variable (current thread's root fiber if not explicitely inside a Fiber), using either a symbol or a string name. If the specified variable does not exist, returns nil.

• https://tool.oschina.net/uploads/apidocs/ruby-1.9.3-core/Thread.html#method-i-5B-5D

  Attribute Reference—Returns the value of a thread-local variable, using either a symbol or a string name. If the specified variable does not exist, returns nil.

The patch uses #thread_variable_set and #thread_variable_get which are part of Ruby itself since 2.0. ActiveSupport contained shims for this in the 4.x series, they were dropped in the 5.x series when Rails adopted a minimum RUBY_VERSION of 2.2, and thus was guaranteed access to those native implementations of thread_varaible_{set,get}

[dry-bot]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
==============================
- spec/extensions/activesupport_taggedlogging_formatter.rb  2

See the complete overview on Codacy

[flash-gordon]

Thanks, I'll make a few tweaks and push a release shortly after.