Can't figure out strictNullCheck option

[ragnese]

Describe the bug
null values can still sneak into a deserialized collection-of-non-nullables if you use the inline-reified ObjectMapper.readValue extension methods, among others.

To Reproduce

val mapper = ObjectMapper().registerModule(KotlinModule(strictNullChecks = true))
val tf = mapper.typeFactory // less typing below
val json = "[1, 2, 3, null]"

// Every one of the following succeed

val l1 = mapper.readValue<List<Int>>(json) // This is the inline reified extension. 
val l2 = mapper.readValue<List<Int>>(json, jacksonTypeRef<List<Int>>()) // This is what the inline reified really calls. 
val l3 = mapper.readValue<List<Int>>(json, tf.constructCollectionLikeType(List::class.java, tf.constructType(jacksonTypeRef<Int>())) 
val l4 = mapper.readValue<List<Int>>(json, tf.constructCollectionLikeType(List::class.java, Int::class.java))
val l5 = mapper.readValue<List<Int>>(json, tf.constructCollectionType(List::class.java, tf.constructType(jacksonTypeRef<Int>()))
val l6 = mapper.readValue<List<Int>>(json, tf.constructCollectionType(List::class.java, Int::class.java))

println(l1) // [1, 2, 3, null]
println(l2) // [1, 2, 3, null]
println(l3) // [1, 2, 3, null]
println(l4) // [1, 2, 3, 0]
println(l5) // [1, 2, 3, null]
println(l6) // [1, 2, 3, 0]

Expected behavior
All of the above mapper calls should fail

NOTE: The ones that use Int::class.java (l4 and l6) do fail if I also enable DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES. But, in that case, it doesn't even matter if strictNullChecks is enabled or not.

In fact, none of the above results seem to care if I enable strictNullChecks.

Versions
Kotlin: 1.4.something
Jackson-module-kotlin: 2.12.3+
Jackson-databind: 2.12.3+

Additional context
I have no idea why this doesn't seem to work for me. I must be doing something wrong, but I don't know what.

[dinomite]

This is because KotlinValueInstantiator.createFromObjectWith(), where strictNullChecks is enforced, isn't called for any of these calls that create a collection without an enclosing object, due to jackson-databind's design. The first test in this gist demonstrates strictNullChecks with an enclosing object, in which case an exception is thrown:

com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of kotlin.Int collection failed for JSON property list due to null value in a collection that does not allow null values
 at [Source: (String)"{"list": [1, null]}"; line: 1, column: 19] (through reference chain: com.fasterxml.jackson.module.kotlin.test.github.failing.GitHub479Test$fullObject$Data["list"])

There might be some other method of ValueInstantiator that the Kotlin module could override to enforce non-nullability for such collection types.

[k163377]

This issue is closed as a duplicate of #399.