Weaver's streets Ud 1.6

I was reading the Ud 1.6 today and got wandering about this:

patta­cīvara­mādāya rājagahaṃ piṇḍāya pāvisi—yena daliddavisikhā kapaṇavisikhā pesakā­ra­visi­khā

The general meaning from daliddavisikhā and kapaṇavisikhā is, that he was going to the poor places - but why weaver’s streets? What’s the story behind this? Why is it presupposed, that weavers were poor people?

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