fix: spy on an instance and not a prototype

[Demivan]

tinyspy mocks object prototype instead of instance.
This works with nanospy

Related vitest issue: vitest-dev/vitest#645

[Demivan]

@sheremet-va @Aslemammad
Locally I have removed all logic related to protoDescriptor and all tests pass now.
In which case overriding prototype was needed?

[sheremet-va]

@sheremet-va @Aslemammad
Locally I have removed all logic related to protoDescriptor and all tests pass now.
In which case overriding prototype was needed?

Prototype is used only as the last resort, no?

[Demivan]

First getOwnPropertyDescriptor is called on an object - it is undefined because method is on prototype.
But this does not mean that prototype override it needed. defineProperty can be called on an instance too.

[Demivan]

@sheremet-va I have pushed a fix. I cannot think of fail test for this case.

All vitest tests still pass with this change.

[sheremet-va]

Released in 0.2.10