def deep_merge!(other_hash, &block)
      other_hash.each_pair do |current_key, other_value|
        this_value = self[current_key]

        self[current_key] = if this_value.is_a?(Hash) && other_value.is_a?(Hash)
          _this_value = HashExt.new.replace(this_value)
          _this_value.deep_merge(other_value, &block).to_h
        else
          if block_given? && key?(current_key)
            block.call(current_key, this_value, other_value)
          else
            other_value
          end
        end
      end

      self
    end
def deep_merge!(other_hash, &block)
      other_hash.each_pair do |current_key, other_value|
        this_value = self[current_key]

        self[current_key] = if this_value.is_a?(Hash) && other_value.is_a?(Hash)
          _this_value = HashExt.new.replace(this_value)
          _this_value.deep_merge(other_value, &block).to_h
        else
          if block_given? && key?(current_key)
            block.call(current_key, this_value, other_value)
          else
            other_value
          end
        end
      end

      self
    end
Same as +deep_merge+, but modifies +self+.