elad-yosifon opened a new issue, #226:
URL: https://github.com/apache/avro-rs/issues/226
#### Code Example:
```rust
struct X {
#[serde(skip_serializing_if = "Option::is_none")]
y: Option<String>,
z: Option<i8>
}
```
#### Issue Description:
while trying to serialize an instance such as `X { y: None, z: Some(0)}`
using `Writer::append_ser(..)`, it panics with an index-out-of-bounds error
pointing to:
[#/src/ser_schema.rs:376:45](https://github.com/apache/avro-rs/blob/d8bc430148a0f160334a9b5ee661178f4e701892/avro/src/ser_schema.rs#L376)
#### RCA:
* Serde allows for field skipping using the `skip_serializing_if` directive.
* current implementation assumes that schema field count matchs the number
of `serializer.serialize(..)` calls 100%.
* Use of unsafe random-access on a vec, panics when the assumption breaks.
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