Lua format.string can't format float as decimal (%d) as of 5.3

Question

I recently upgraded from Lua 5.2.3 to 5.3.1 but I noticed all my scripts that perform a string.format started failing if it tried to format a float using %d

local anExampleString = string.format("Sample Number: %d",10.100000001) -- Fails on 5.3.1, works on 5.2.3
local aWorkingString  = string.format("Sample Number: %.0f",10.100000001) -- Works on 5.3.1

Is this by design? I can't seem to find the change documented anywhere.

Aweinspiring

Answer 1

In Lua 5.3, the number type has two subtypes, integer and float.

From string.format

Options A, a, E, e, f, G, and g all expect a number as argument. Options c, d, i, o, u, X, and x expect an integer.

Mountie

The design of Lua 5.3 isn't clean in many ways, f.e. math.tointeger (while tostring & tonumber is in _G), math.type (just to differentiate integer and float), math.ult (needless?), etc. – Surveying

Thanks for that, I missed that completely (even though it was the obvious place to look). I think I was expecting a more explicit note to say it had been changed from 5.2->5.3 like in here – Aweinspiring