Passing specs

spec/tags/core/string/to_f_tags.txt

@@ -1,9 +1,4 @@
-fails:String#to_f treats leading characters of self as a floating point number
-fails:String#to_f treats special float value strings as characters
 fails:String#to_f allows for varying case
 fails:String#to_f allows for varying signs
 fails:String#to_f allows for underscores, even in the decimal side
-fails:String#to_f returns 0 for strings with any non-digit in them
-fails:String#to_f returns 0 for strings with leading underscores
 fails:String#to_f takes an optional sign
-fails:String#to_f returns 0.0 if the conversion fails