What is a regular int and what are the nuances of its implementation?

int in Go is a signed integer type whose size depends on the processor architecture. On 32-bit systems, it is 32 bits, and on 64-bit systems, it is 64 bits.

Implementation nuances:

• Architecture dependence: The main nuance is that the size of int is not fixed and is determined by the architecture on which the program is compiled and run. This can lead to issues with implicit type conversions or data serialization/deserialization between systems with different bitness.
• Value range: The range of int also depends on its size. For 32 bits, it is approximately from -2 billion to +2 billion, and for 64 bits, it is significantly larger. Incorrect assumptions about the range can lead to overflow.
• Performance: Using int is usually optimal in terms of performance, as it matches the native machine word. However, overly large int64 on a 32-bit system may require additional instructions.
• Implicit conversion: Go does not allow implicit conversion between int and other integer types (e.g., int32, int64), which prevents potential errors related to loss of precision or overflow. Explicit type conversion is required.

Example of explicit type conversion:

// Convert int to int64
var a int = 10
var b int64 = int64(a)