According to this "Unsupported Characters List" that we have to submit for Nintendo Lot Check, Nintendo think that 0x0153 is in the range "[European Characters] 0x00a0--0x00ff". Nice of them to sneak that in there to catch us out.
And I really like how there's this little picture of the letter A, when the character it represents is actually A. That was a neat little point. made neater by the fact our game supports one and not the other.
*sigh* Time for me to rattle off an abusive E-mail...