# Functions
MatchFunc return Matcher from closure.
StreamClientInterceptor returns a new stream client interceptor that will decide whether to call the interceptor based on the return argument from the Matcher.
StreamServerInterceptor returns a new stream server interceptor that will decide whether to call the interceptor based on the return argument from the Matcher.
UnaryClientInterceptor returns a new unary client interceptor that will decide whether to call the interceptor based on the return argument from the Matcher.
UnaryServerInterceptor returns a new unary server interceptor that will decide whether to call the interceptor based on the return argument from the Matcher.
# Interfaces
Matcher allows matching.