Cocoa Typography: wrong presentation of space unicode characters

It seems that something wrong with typography system in Cocoa.

When i try to draw string over the screen with drawInRect (Helvetica):

NSString *tot = [NSString stringWithFormat:@"MMM%CMMM%CMMM MMM", 0x2002, 0x20];

all spaces between letters are the same. But first unicode character is En Space - Width of one en (half of one em).

Same spaces with ot开发者_JAVA技巧her characters, like Four-Per-Em Space Mid Space and so on.

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Even tho the glyph you want to draw ('En Space U+2002') is "just a space", it still has to be available in the font you are using.

You will need a much better font than the operating system bundled Helvetica if you want En Space, Four-Per-Em Space, etc.