Using list values of type 'number' in a formula related to a column of type integer doesn't generate the correct results

Problem

When the list value used in a formula is of type number, integers cannot be used anymore.

Grid configuration

#
# Setup of a grid with a dropdown list containing products
# And a calculation of the VAT.
#

gd.columns=iproduct, price, tvanumber, tvanumberincluded, tvaint, tvaintincluded 
gd.tablename=numberz 
gd.ds=igridtest 

#
# Generate the list, iprice is a decimal number type
#

col.iproduct = Product 
col.iproduct.type = list 
col.iproduct.query = select iname, icode, iprice from products_d2 
col.iproduct.query.ds = igridtest 

#
# Show the price in its own column
#

col.price = Unit price 
col.price.type = number 
col.price.formula = {iproduct.iprice} 


# 
# The calculation of the price including VAT is correct when 
# the VAT column is a number
#

col.tvanumber= Tva 
col.tvanumber.type = number 

col.tvanumberincluded= TVA included 
col.tvanumberincluded.formula = {iproduct.iprice} * (1 + {tvanumber}/100) 


# 
# The calculation of the price including VAT is not correct when 
# the VAT column is an integer
#



col.tvaint= Tva 
col.tvaint.type = integer 
col.tvaintincluded= TVA included 
col.tvaintincluded.formula = {iproduct.iprice} * (1 + {tvaint}/100)

Reason

In the configuration:

col.tvanumberincluded.formula = {iproduct.iprice} * (1 + {tvanumber}/100) 
col.tvaintincluded.formula = {iproduct.iprice} * (1 + {tvaint}/100)

tvaint column is of integer type, and thus we pass it to JEXL as an Integer Object, and when tvaint is divided by 100, the result is coerced back to Integer (by JEXL):

`{iproduct.iprice} * (1 + {tvaint}/100)`: `100 * {1 + ((Integer)10/100)}` <=> `100 * {1 + ((Integer)1/10)}` => `100 * {1 + 0}`

while tvanumber is of number type, and thus we pass it to JEXL as a BigDecimal, and when tvanumber is divided by 100, the result is coerced back to BigDecimal (by JEXL):