Feature: Add ToSliceX for numeric types

[shayan-yousefi]

I propose adding ToSliceX helper functions to the cast package for converting values into slices of numeric types (e.g. []int, []int64, []float64).

Proposed API

ToIntSlice(i interface{}) []int
ToIntSliceE(i interface{}) ([]int, error)

ToInt64Slice(i interface{}) []int64
ToFloat64Slice(i interface{}) []float64

/* other functions */

These functions would convert common inputs like []interface{}, []string, or already-typed slices.

Benefits

• Reduces boilerplate
• Improves consistency with existing cast APIs
• Makes numeric slice handling simpler and safer

Contribution

I’m happy to implement this feature, including tests and documentation, if the maintainers agree with the approach.

[sagikazarmark]

The proposed API already exists. Can you clarify what you have in mind?

[shayan-yousefi]

Hi, in the slice.go file I only see ToSliceE(i any) ([]any, error) and ToStringSliceE(i any) ([]string, error). I might be mistaken, though.