Floats are truncated when cast to longs with /data, all other cases round down

Using `data modify storage ...`, you can cast a float or double to a byte, int, or long by appending it to an array of the corresponding type. When doing this, all cases round down, except appending a float to a long array, which truncates the value instead.

How to reproduce:

1. Run commands to create byte, int, and long arrays:

   /data modify storage test byte set value [B;]
   /data modify storage test int set value [I;]
   /data modify storage test long set value [L;]

2. Append a float and a double to each array. Make sure the number is negative and not an integer, so that truncating behaves differently than rounding down.

   /data modify storage test byte append value -1.5f
   /data modify storage test byte append value -1.5d
   
   /data modify storage test int append value -1.5f
   /data modify storage test int append value -1.5d
   
   /data modify storage test long append value -1.5f
   /data modify storage test long append value -1.5d

3. Get the values of the arrays:

   /data get storage test

4. You can see that both the byte and int arrays are [-2, -2], while the long array is [-1, -2], meaning that the float got truncated instead of rounded down when cast to a long.

I would expect that all cases would be consistent, rather than having one combination that behaves differently than all of the others.