config/template.go
func (c *TemplateConfigs) Merge(o *TemplateConfigs) *TemplateConfigs {
	if c == nil {
		if o == nil {
			return nil
		}
		return o.Copy()
	}

	if o == nil {
		return c.Copy()
	}

	r := c.Copy()

	*r = append(*r, *o...)

	return r
}
func (c *TemplateConfigs) Merge(o *TemplateConfigs) *TemplateConfigs {
	if c == nil {
		if o == nil {
			return nil
		}
		return o.Copy()
	}

	if o == nil {
		return c.Copy()
	}

	r := c.Copy()

	*r = append(*r, *o...)

	return r
}
// Merge combines all values in this configuration with the values in the other
// configuration, with values in the other configuration taking precedence.
// Maps and slices are merged, most other values are overwritten. Complex
// structs define their own merge functionality.