How to prevent setting invalid paths?

[chipit24]

The following code works fine:

this.$vueSet({}, 'foo.0.bar'); // { "foo": [{ "bar": "some value" }] }
this.$vueSet({}, 'foo.000'); // { "foo": ["some value"] }

However, the following code produces an error:

this.$vueSet({}, 'foo.000.bar'); // error TypeError: Cannot use 'in' operator to search for 'bar' in undefined

If I wrap it in a try/catch block, Vue still complains:

[Vue warn]: Cannot set reactive property on undefined, null, or primitive value: undefined

Is there some strategy for validating object paths? Considering foo.000 works, I also expect foo.000.bar to work.