Should reloader load in a go routine or not?

[juvenn]

// refreshAsync reloads value in a go routine or using custom executor if defined.
func (c *localCache) refreshAsync(en *entry) bool {
	if en.setLoading(true) {
		// Only do refresh if it isn't running.
		if c.reloader == nil {
			go c.refresh(en)
		} else {
			c.reload(en)
		}
		return true
	}
	return false
}

Inspecting the code, I find that the loader refresh in a new go routine, while reloader reload in the current routine. Why the difference? Should we define the loader load in new go routine, or current routine?

[nqv]

reloader is a user-defined way to refresh cache entries, e.g. using a pool to avoid creating a new goroutine for each refresh. loader is a cache loader function, must be synchronous.