Test extension to packagist submitted successfully, but composer installation failed

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Today I want to submit a little bit of stuff to packagist according to the tutorials; but at the last step of the tutorials, I made a mistake.

I didn"t report an error when I submitted it to packagist; but if I execute composer require daji/hello in another project, what if I report an error?
I don"t know why

Packagist.org composer php

Feb.28,2021

you download the stable version by default, but you submit the dev version, so you can't find it, so try downloading the dev version instead.

minimum-stability

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