fix: yaml with merge

[IvanJosipovic]

Fixes #1331

I needed to change CommonDeserializerBuilder to a method, without this, I kept on getting duplicate key errors.

[tg123]

/LGTM

thanks!

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@@            Coverage Diff            @@
##             master    #1332   +/-   ##
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[tg123]

/LGTM

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