https://bugs.freedesktop.org/show_bug.cgi?id=64132

          Priority: medium
            Bug ID: 64132
          Assignee: [email protected]
           Summary: Calc string-number coercion
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: [email protected]
          Hardware: x86 (IA32)
            Status: UNCONFIRMED
           Version: 3.5.4 release
         Component: Spreadsheet
           Product: LibreOffice

In calc, a formula like sum(a1:a3) applied to cells which contain a string
results in the string being coerced to 0. However, if the the string contains a
number, this coercion is incorrect.

This *is* a bug, since the correct behaviour would be to signal an error
indicating the formula has been applied to invalid inputs.

This bug bit when copying numbers from one program into libreoffice/calc. One
of the numbers was read as a string by calc, and the resulting column tally was
off by ~$400. This wasn't noticed til it was too late...

---
Btw, I discovered after the fact that View->Value Highlighting provides a way
to diagnose problems with string->0 coercion.

---
Here is a simple example:

a1: "I am not a number"
a2: =sum(a1:a1)

This may be related to
https://bugs.freedesktop.org/show_bug.cgi?id=59309

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