domoritz opened a new issue, #40851:
URL: https://github.com/apache/arrow/issues/40851
### Describe the bug, including details regarding any error messages,
version, and platform.
```ts
const array = Int32Array.from([1, 12, 34])
const vec1 = arrow.vectorFromArray(array);
console.log(vec1.nullable) // should be false
console.log(vec1.nullCount) // should be 0
```
```ts
const vec2 = arrow.vectorFromArray([1, 2, 3]);
console.log("vec2")
console.log(vec2.nullCount) // should be 0
vec2.set(0, null)
console.log(vec2.nullCount) // should be 1 but is 2
```
### Component(s)
JavaScript
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