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+.Dd $Mdocdate: July 26 2022 $
+.Dt LUAL_OPTNUMBER 3
+.Os
+.Sh NAME
+.Nm luaL_optnumber
+.Nd if the function argument is a number, returns this number
+.Sh SYNOPSIS
+.In lauxlib.h
+.Ft lua_Number
+.Fn luaL_optnumber "lua_State *L" "int narg" "lua_Number d"
+.Sh DESCRIPTION
+.Fn luaL_optnumber
+if the function argument
+.Fa narg
+is a number, returns this number.
+If this argument is absent or is
+.Dv nil ,
+returns
+.Fa d .
+Otherwise, raises an error.
+.Sh HISTORY
+The
+.Fn luaL_optnumber
+manual page was written by Sergey Bronnikov.