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: matcher.go
    path of file: ./repos/fabio/route
    
    the code of the file until where you have to start completion: package route

import (
	"strings"
)

// matcher determines whether a host/path matches a route
type matcher func(uri string, r *Route) bool

// Matcher contains the available 
    
func iPrefixMatcher(uri string, r *Route) bool {
	// todo(fs): if this turns out to be a performance issue we should cache
	// todo(fs): strings.ToLower(r.Path) in r.PathLower
	lowerURI := strings.ToLower(uri)
	lowerPath := strings.ToLower(r.Path)
	return strings.HasPrefix(lowerURI, lowerPath)
}