INDEX function discrepancy

[MrFoote]

Describe the bug
The INDEX() function does not behave like in Excel, specifically for the case where col = 0 i.e. when it should take the full column. Summing over an INDEX() goes wrong.

To Reproduce

# Excel file 'python_formulas_index_bug.xlsx' as below (sheet name: Sheet1)

#   A   B   C
#1  1   4   7
#2  2   5   8
#3  3   6   9

# E2 = 2
# E3 =SUM(INDEX(A2:C4;0;E2))

# Instruction:
# Compile a python formulas function with E2 as input and E3 as output 
# Excel returns E3 value = 15, i.e. the sum of the 2nd column in the A2:C4 range, as expected. Formulas returns 4 = the first value in the (correct) column of the range. This is incorrect.

# Code to reproduce error
import formulas
filepath = 'python_formulas_index_bug.xlsx'
xl_model = formulas.ExcelModel().loads(filepath).finish()
excel_inputs  = ["'[python_formulas_index_bug.xlsx]SHEET1'!E2"]
excel_outputs = ["'[python_formulas_index_bug.xlsx]SHEET1'!E3"]
func = xl_model.compile(inputs = excel_inputs, outputs = excel_outputs)
func(2) # Expected 15, get 4

Desktop (please complete the following information):

• OS: macOS
• Version 14.2.1 (23C71)

Additional context
Hey! Formulas is an awesome library. I was looking at the INDEX() implementation to see if I could figure out the problem, but I didn't get anywhere. Really appreciate your work, thank you! Sincerely /Christoffer Jevring