Have source_caching_disabled hard default to false.

Fancy format detection is fragile and might break in unusual
configurations, leading to developer frustration.

lib/given/module_methods.rb

@@ -23,14 +23,6 @@ def self.source_caching_disabled=(value)
     @_gvn_source_caching_disabled = value
   end
 
-  # Detect the formatting requested in the given configuration object.
-  #
-  # If the format requires it, source caching will be enabled.
-  def self.detect_formatters(c)
-    format_active = c.formatters.any? { |f| f.class.name !~ /ProgressFormatter/ }
-    Given.source_caching_disabled = ! format_active
-  end
-
   # Globally enable/disable natural assertions.
   #
   # There is a similar function in Extensions that works at a

lib/given/rspec/configure.rb

@@ -16,5 +16,5 @@
   end
 
   Given.use_natural_assertions if Given::NATURAL_ASSERTIONS_SUPPORTED
-  Given.detect_formatters(c)
+  Given.source_caching_disabled = false
 end