Add utility to check for build number

modules/misc.lua

@@ -9,7 +9,7 @@ local _, namespace = ...
 --]]
 
 -- game version API
-local _, _, _, interfaceVersion = GetBuildInfo()
+local _, buildVersion, _, interfaceVersion = GetBuildInfo()
 --[[ namespace:IsRetail()
 Checks if the current client is running the "retail" version.
 --]]
@@ -31,6 +31,18 @@ function addon:IsClassic()
 	return not addon:IsRetail() and not addon:IsClassicEra()
 end
 
+--[[ namespace:HasBuild(_buildNumber_[, _interfaceVersion_])
+Checks if the current client is running a build equal to or newer than the specified.  
+Optionally also check against the interface version.
+--]]
+function addon:HasBuild(build, interface)
+	if interface and interfaceVersion < interface then
+		return
+	end
+
+	return tonumber(buildVersion) >= build
+end
+
 --[[ namespace:ArgCheck(arg, argIndex, type[, type...])
 Checks if the argument `arg` at position `argIndex` is of type(s).
 --]]