SE450: Horstmann Chapter 3: Consistency

Bad example: String class
```
s.equals(t) / s.equalsIgnoreCase(t)
```

But

boolean regionMatches(int toffset, 
   String other, int ooffset, int len) 
boolean regionMatches(boolean ignoreCase, int toffset, 
   String other, int ooffset, int len)

Why not regionMatchesIgnoreCase?
Very common problem in student code