ActiveSupport::NumberHelper#number_to_human now returns the number unaltered when
the units hash does not contain the needed key, e.g. when the number provided is less
than the largest key provided.
Always merge I18n format values, namespaced or not, over the default
ones, to ensure I18n format defaults will have precedence over our
namespaced values.
Precedence should happen like this:
default :format
default :namespace :format
i18n :format
i18n :namespace :format
Because we cannot allow our namespaced default to override a I18n
:format config - ie precision in I18n :format should always have higher
precedence than our default precision for a particular :namespace.
Also simplify default format options logic.
Action Pack already comes with a default locale fine for :en, that is
always loaded. We can just fallback to this locale for defaults, if
values for the current locale cannot be found.
Closes#4420, #2802, #2890.
Some of these requires are now only necessary in
ActiveSupport::NumberHelper. Add hash/keys require due to symbolize_keys
usage in number helpers. Also remove some whitespaces.
Closes#6414
