func (er erasureObjects) DecomTieredObject(ctx context.Context, bucket, object string, fi FileInfo, opts ObjectOptions) error {
	if opts.UserDefined == nil {
		opts.UserDefined = make(map[string]string)
	}
	// overlay Erasure info for this set of disks
	storageDisks := er.getDisks()
	// Get parity and data drive count based on storage class metadata
	parityDrives := globalStorageClass.GetParityForSC(opts.UserDefined[xhttp.AmzStorageClass])

<p>
The built-in functions <code>append</code> and <code>copy</code> assist in
common slice operations.
For both functions, the result is independent of whether the memory referenced
by the arguments overlaps.
</p>

<p>
The <a href="#Function_types">variadic</a> function <code>append</code>
appends zero or more values <code>x</code> to a slice <code>s</code> of