When using split to convert strings to numbers (the default) it seems to have precision issues converting integers well below the 64 bit limit:

p=split("123456789", " ")
?p[1]
?math.type(p[1])

shows 123456792 and indicates the type is integer

p=split("123456789", " ", false)
n=tonum(p[1])
?n
?math.type(n)

shows 123456789 and also indicates the type is integer.