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Showing content from https://github.com/uBlockOrigin/uBlock-issues/issues/847 below:

"0" prefixes are currently not accepted as valid hosts entries · Issue #847 · uBlockOrigin/uBlock-issues · GitHub

Prerequisites Description

Currently, 0 example.org does not block the site, whereas ::1 example.org, 127.0.0.1 example.org and 0.0.0.0 example.org does.

This is believed to affect the following lists:

This is to a certain extent related to #800, but does not seem to me to be a duplicate of it. I'm able to get :: example.org to work in Nano but not in uBO, whereas 0 example.org doesn't work in either of them.

A specific URL where the issue occurs

Depends on the site you'd want to block. For the examples above it's example.org.

Steps to Reproduce
  1. Paste 0 example.org in My Filters.
  2. Visit example.org.
  3. See that no page warnings show up, nor are the (few) on-site elements blocked.
Expected behavior:

A page warning shows up.

Actual behavior:

The site loads normally.

Your environment

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