Resolve "Merge the best from 7.40 branch"

SabrehavenOTClient/modules/corelib/math.lua

@@ -0,0 +1,35 @@
+-- @docclass math
+
+local U8  = 2^8
+local U16 = 2^16
+local U32 = 2^32
+local U64 = 2^64
+
+function math.round(num, idp)
+  local mult = 10^(idp or 0)
+  if num >= 0 then
+    return math.floor(num * mult + 0.5) / mult
+  else
+    return math.ceil(num * mult - 0.5) / mult
+  end
+end
+
+function math.isu8(num)
+  return math.isinteger(num) and num >= 0 and num < U8
+end
+
+function math.isu16(num)
+  return math.isinteger(num) and num >= U8 and num < U16
+end
+
+function math.isu32(num)
+  return math.isinteger(num) and num >= U16 and num < U32
+end
+
+function math.isu64(num)
+  return math.isinteger(num) and num >= U32 and num < U64
+end
+
+function math.isinteger(num)
+  return ((type(num) == 'number') and (num == math.floor(num)))
+end