I write a gem use the code from `sequel/extensions/blank`, when i reading
following code, i don't understand why we need run `alias_method` like
following?
```rb
[FalseClass, Object, NilClass, Numeric, String, TrueClass].each do |klass|
# :nocov:
if klass.method_defined?(:blank?)
klass.send(:alias_method, :blank?, :blank?)
end
# :nocov:
end
```
Thank you.
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