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ROUND Accepts null, false, and true as First Parameter (#1837)
* ROUND Accepts null, false, and true as First Parameter Issue #1789 was addressed by PR #1799. In a follow-up discussion, it came to light that ROUND was not handling the unexpected case where the first parameter is an empty cell in the same manner that Excel does. Subsequent investigation showed that a boolean first parameter is permitted. I broadened my investigation to include the following related functions. - ROUNDUP - ROUNDDOWN - MROUND - TRUNC - INT - FLOOR - FLOOR.MATH - FLOOR.PRECISE - CEILING - CEILING.MATH - CEILING.PRECISE All of these allow a NULL first parameter, and all except MROUND allow boolean. For completeness, I will note that all treat null string as invalid. I suspect there are other functions which permit similarly unexpected parameters, but I consider them out of scope for this PR. CEILING.MATH and CEILING.PRECISE were unimplemented, and are now supported as part of this PR. The tests for each of these functions have been re-coded, though all the original test data is still included in the test cases, plus several new cases for each. The new tests now take place as a user would invoke the functions, through a spreadsheet cell rather than a direct call to the appropriate function within Calculation/MathTrig. Aside from being more realistic, the new tests are also more complete. For example, FLOOR.MATH can take from 1-3 arguments, and the existing tests confirmed that the function in Calculation could handle a single argument. However, the function list in Calculation.php erroneously set the number of arguments for FLOOR.MATH to exactly 3, so, if a user tried to get the calculated result of a cell containing FLOOR.MATH(1.2), the result would be an Exception. Aside from the parameter support, there are a few minor code changes. Ods, as well as Gnumeric, allows the omission of the second parameter for FLOAT and CEILING; Excel does not. A potential divide-by-zero error is avoided in CEILING, FLOOR, and FLOORMATH. I will note that it would probably be beneficial in terms of maintainability to break MathTrig up into many individual modules. The same would hold for the other Calculation modules. I would be willing to look into this if you agree that it would be worthwhile.
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