# i54\_ [](https://crates.io/crates/i54_)
A 54-bit signed integer abstraction for Rust. Created for easier interop with GraphQL and Javascript, which don't have proper `i64`-compatible primitives.
## Premise
Both Javascript and GraphQL natively represent large (over 32-bit) integers as signed double-precision floating-point values, and do not have primitives representing large integers.
This presents a problem when wanting to represent an integer larger than a `u32` in Rust, while maintaining type interop with Javascript and GraphQL.
To make programmer intent clear, we provide an `i54` type that should ideally behave similarly to a Rust primitive type, and is intended to represent values that would fit in a hypothetical 54-bit signed integer primitive.
`i54` represents the largest signed integer for which all possible values are encoded exactly by an [IEEE 754 double-precision floating-point representation](https://en.wikipedia.org/wiki/Double-precision_floating-point_format). (Encoded roughly as 52 bits in the mantissa, 1 bit derived from the exponent bits, and 1 sign bit.)
## Exciting Trait Implementations
- `serde` - `Serialize`, `Deserialize`
- `rusqlite` _(optional)_ - `FromSql`, `ToSql`
- `juniper` _(optional)_ - `GraphQLScalar`
## Usage
```toml
[dependencies]
i54_ = {version = "0.2", features = ["rusqlite", "juniper"]}
```
```rust
use i54_::i54;
fn main() {
let mut x: i54 = 1.into();
x += 1.into();
assert!(x == 2);
}
```
### License: MIT OR Apache-2.0 OR CC0-1.0 (public domain)