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function table.dump(t, depth)
if not depth then depth = 0 end
for k,v in pairs(t) do
str = string.rep(' ', depth * 2) .. k .. ': '
if type(v) ~= "table" then
print(str .. tostring(v))
else
print(str)
table.dump(v, depth+1)
end
end
end
function table.copy(t)
local res = {}
for k,v in pairs(t) do
res[k] = v
end
return res
end
function table.selective_copy(t, keys)
local res = { }
for i,v in ipairs(keys) do
res[v] = t[v]
end
return res
end
function table.merge(t, src)
for k,v in pairs(src) do
t[k] = v
end
end