[SOLVED] Bug with INSTRING

[CH3791]

To Stephen:
How do I program using unicode numeric?

To Han:
norm_instring_bug(√7)
cas_instring_bug(√7)
returns 0 in both Home and CAS. Even if the "exact" setting is ticked in CAS.

To Cyrille:
At least with the CAS program, it shouldn't have been evaluated right? Because if we have a program like say

Code:

#cas
return_expression(expression):=
BEGIN
  return expression;
END;
#end

entering return_expression(√7) in CAS will return √7 in exact form. Even without using double quotations marks.

To Tom:
Is your answer of 2 after Prime has automatically added in spaces (so creating a string like this: " √7 ")? Because the answer should be 1 since the √ is in the first position of the string.