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While testing

preact@8within our existing code base, we encountered the following error :As far as I understand,
preact@8components might receive an array containingnullvalues (e.g.[null]) aschildrenproperty while it never happened in the previous versions.This PR attempts to fix the compatibility with
preact@8:npm testorPREACT_VERSION=7.2.0 npm testbut fails withPREACT_VERSION=8.1.0 npm testnullentries that might be received in thechildrenprop. Please tell me if it's a good approach or not.7.2.1and8.1.0totravis.ymlin the last commit, so the test is actually ran on the appropriate versions.