Topic: map boundaries and map.get_field(x,y)

When calculating fields manually one has to check always if the calculated value does not exceed map.width() or is < 0 to get a valid field with map:get_field(x,y). Example for mirroring an existing field at a y-axis:

local map = wl.Game().map
local f = map.get_field(0,0)

local mirrored_field = map.get_field(f.x, f.y - 3)    -- doesn't work because f.y = 0-3 = -3

To get around this one has to create a new Lua function which takes care if the value isn't correct and call this function first, e.g.

local new_y = check_map_wrap(f.y - 3)                -- on a map with height 64 it will return 61
local mirrored_field = map.get_field(f.x, new_y)     -- all fine

Wouldn't it be possible to have such a recalculating automatically in map:get_field(x,y)? Or create another function map:get_map_field(x,y) wich takes care of map boundaries?

Somewhere in the code must be such a check, e.g. when calling field:region() or using field.ln (left neighbor field) the result takes care of map boundaries. But i was not able to find such recalculating in the code

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