Description:
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It's not possible to get the details for version 1.0.1 of the big_int package using the rest API:

$ curl -sSLf https://pecl.php.net/rest/r/big_int/1.0.1.xml >/dev/null
curl: (22) The requested URL returned error: 404 Not Found

This version 1.0.1 should exist (as reported by https://pecl.php.net/rest/r/big_int/allreleases.xml), and indeed fetching the other versions work.
It's only version 1.0.1 which is problematic.

Test script:
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curl -sSLf https://pecl.php.net/rest/r/big_int/1.0.1.xml >/dev/null