You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: collate.go
    path of file: ./repos/malice/vendor/golang.org/x/text/collate
    
    the code of the file until where you have to start completion: // Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// TODO: remove hard-coded versions when we have implemented fractional weights.
/
    
func (c *Collator) Compare(a, b []byte) int {
	// TODO: skip identical prefixes once we have a fast way to detect if a rune is
	// part of a contraction. This would lead to roughly a 10% speedup for the colcmp regtest.
	c.iter(0).SetInput(a)
	c.iter(1).SetInput(b)
	if res := c.compare(); res != 0 {
		return res
	}
	if !c.ignore[colltab.Identity] {
		return bytes.Compare(a, b)
	}
	return 0
}