fix(core): remove some incorrect type assertions #826
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When working on
typedoc-plugin-markdown, I found that the members function accepts anundefinedmodelargument during runtime, while the TS types saymodelmust be an array.After some debugging, I found the reason.
model.childrenhere isDeclarationReflection[] | undefined, but it's forced to be asserted asDeclarationReflection[].I found that type assertions are relatively evaluated and should be avoided if we can. This PR removes some build-time type assertions and replaces them with runtime types.