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Look for your function in the interface file, then for the third field
-in the pragma; it should say <Literal>_S_ <string></Literal>. The <Literal><string></Literal>
-gives the strictness of the function's arguments. <Function>L</Function> is lazy
-(bad), <Function>S</Function> and <Function>E</Function> are strict (good), <Function>P</Function> is “primitive” (good),
-<Function>U(...)</Function> is strict and
-“unpackable” (very good), and <Function>A</Function> is absent (very good).
+in the pragma; it should say <Literal>__S
+<string></Literal>. The <Literal><string></Literal> gives
+the strictness of the function's arguments. <Function>L</Function> is
+lazy (bad), <Function>S</Function> and <Function>E</Function> are
+strict (good), <Function>P</Function> is “primitive”
+(good), <Function>U(...)</Function> is strict and
+“unpackable” (very good), and <Function>A</Function> is
+absent (very good).
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