Question: Why are custom replacements ran twice?

[jdevera]

I noticed this block

     if replacements:
        for old, new in replacements:
            text = text.replace(old, new)

appears twice in slugify. Why is that? Would it not make sense to have some pre-replacements and post-replacements instead?

[un33k]

Test with care, some post slugify strings may end up with replacement words after the conversion, specially in non-english languages.