Avoiding boxing (causing many small allocations) in generic classes

interface IValueWrap
{
    void SetFloatValue(float v);
    void SetValue(object v);
}
public class ValueWrap<T> : IValueWrap
{
    public T val;
    public void SetValue(object v)
    {
        val = (T)System.Convert.ChangeType(v, typeof(T));
    }
    public void SetFloatValue(float v)
    {
        // val = val switch
        // {
        //    float f => v,  // Error: Cannot implicitly convert type 'float' to 'T'
        //    _ => (T) System.Convert.ChangeType(v, typeof(T))
        // };

        // switch (val)
        // {
        //    case float floatVal: val = v; break;  // Error: Cannot implicitly convert type 'float' to 'T'
        //    default: SetValue(val); break; 
        // }

        if (typeof(T) == typeof(float))
        {
            // val = v;          // Error: Cannot implicitly convert type 'float' to 'T'
            // val = (T) v;      // Error: Cannot convert type 'float' to 'T'
            // Set(v);           // Error: ... There is no boxing conversion from 'float' to 'T'
            val = (T)(object)v;  // Works, but how can I avoid boxing/unboxing to object?
        }
        else
            SetValue(v);
    }
    public void Set<T2>(T2 v) where T2 : T
    {
        val = v;
    }
}

interface IValueWrap
{
    void SetFloatValue(float v);
    void SetValue(object v);
}
public class ValueWrap<T> : IValueWrap
{
    public T val;
    public void SetValue(object v)
    {
        val = (T)System.Convert.ChangeType(v, typeof(T));
    }
    public void SetFloatValue(float v)
    {
        // val = val switch
        // {
        //    float f => v,  // Error: Cannot implicitly convert type 'float' to 'T'
        //    _ => (T) System.Convert.ChangeType(v, typeof(T))
        // };

        // switch (val)
        // {
        //    case float floatVal: val = v; break;  // Error: Cannot implicitly convert type 'float' to 'T'
        //    default: SetValue(val); break; 
        // }

        if (typeof(T) == typeof(float))
        {
            // val = v;          // Error: Cannot implicitly convert type 'float' to 'T'
            // val = (T) v;      // Error: Cannot convert type 'float' to 'T'
            // Set(v);           // Error: ... There is no boxing conversion from 'float' to 'T'
            val = (T)(object)v;  // Works, but how can I avoid boxing/unboxing to object?
        }
        else
            SetValue(v);
    }
    public void Set<T2>(T2 v) where T2 : T
    {
        val = v;
    }
}