The cell reference syntax seems to allow decimal numbers. It should not.
Restrict the numbers to integers.
Part 4, 3.17.2.3
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Proposed Disposition of DIS 29500 Comment ECMA-0031 (Modified: 2007-12-05) Agreed; in response to comments AU-0011, CA-0043, FR-0436, GB-0361, and US-0245, the grammar for SpreadsheetML formulas has been completely rewritten using the notation defined by ISO/IEC 14977:1996, “Syntactic metalanguage — Extended BNF”. As a result, the syntax for cell references is, as follows: A1-reference= A1-column, ":", A1-column | A1-row, ":", A1-row | A1-column, A1-row ; A1-column= A1-relative-column | A1-absolute-column ; A1-relative-column= letter, {letter} ; (* see semantic rules at 3.17.2.3.1 *) letter= "a"|"b"|"c"|"d"|"e"|"f"|"g"|"h"|"i"|"j"|"k"|"l"|"m"| "n"|"o"|"p"|"q"|"r"|"s"|"t"|"u"|"v"|"w"|"x"|"y"|"z"| "A"|"B"|"C"|"D"|"E"|"F"|"G"|"H"|"I"|"J"|"K"|"L"|"M"| "N"|"O"|"P"|"Q"|"R"|"S"|"T"|"U"|"V"|"W"|"X"|"Y"|"Z" ; A1-absolute-column= "$", A1-relative-column ; A1-row= A1-relative-row | A1-absolute-row ; A1-relative-row= digit-sequence ; (* must be non-zero; see 3.17.2.3.1 *) A1-absolute-row= “$”, A1 -relative-row ;
