isInternalEntity: Assert the value is an object

[kettanaito]

GitHub

• Fixes Handle Undefined Object in isInternalEntity #94
• A prerequisite for feat: support primitive arrays in models #98, Support nested objects and arrays in the model definition #113

Changes

• Asserts that the given value is an object during the isInternalEntity check.

This prevents the isInternalEntity check to throw an exception when handling non-object types (still possible on runtime with the nested properties in model declarations).

TypeError: Cannot use 'in' operator to search for '__type' in "some value"

[kettanaito]

Hey, @gidesan. Please, would you have a minute to review this change? I believe we can use it in your pull request, as well as in #98. I feel this is a general bug fix we should introduce regardless of the features. Thanks.

[kettanaito]

Using unknown is more suitable here, but there have been some issues with adopting unknown for our TypeScript users in the past. I'd migrate from any to unknown as a separate, carefully released change.