fix(runtime-core): optional props from Mixin/Extends are treated as r…#2048

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yyx990803 merged 2 commits intovuejs:masterfrom wonderful-panda:fix-2039

Sep 16, 2020

+133-46

Commits on Sep 16, 2020

fix(runtime-core): optional props from Mixin/Extends are treated as required (vuejs#2039 )

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chore: remove unused arg for ExtractPropTypes
yyx990803
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