| A cast from `long` to `double` may lose precision. Prefer an explicit cast to an |
| implicit conversion if this was intentional. |
| |
| Consider |
| [`com.google.protobuf.util.Values`](https://developers.google.com/protocol-buffers/docs/reference/java/com/google/protobuf/util/Values) |
| which has a method `of(double value)`, and the following example: |
| |
| ```java |
| // Values.of receives a long, which is implicitly converted to double: |
| long value = 123L; |
| Values.of(value); |
| ``` |
| |
| Prefer this (to make existing behavior explicit): |
| |
| ```java |
| long value = 123L; |
| Values.of((double) value); |
| ``` |
| |
| From [JLS §5.1.2]: |
| |
| > A widening primitive conversion from `int` to `float`, or from `long` to |
| > `float`, or from `long` to `double`, may result in loss of precision - that |
| > is, the result may lose some of the least significant bits of the value. In |
| > this case, the resulting floating-point value will be a correctly rounded |
| > version of the integer value, using IEEE 754 round-to-nearest mode |
| |
| [JLS §5.1.2]: https://docs.oracle.com/javase/specs/jls/se11/html/jls-5.html#jls-5.1.2 |
