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Checking the Magento core I see two patterns a class with the slash in the beginning and a class without it.

Magento 2 Core preference type

What would be the difference?

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As far as I can tell, there is none. I used to write the fully qualified class name with the leading slash and now I do it without the leading slash. Plugins, preferences, virtual types, arguments and anything else I have worked on have had no noticeable difference.

Looking at the phpClassName simpleType in vendor/magento/framework/ObjectManager/etc/config.xsd the pattern match for the start of the string is: \\? (Match 0 or 1 of the \ character) so it would seem that that the expected input does not care.

The only difference there potentially could be is a negligible performance difference, however the effort to investigate, benchmark and identify the faster option would be better spent working on the code in your own modules.

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