py/unicode: Add unichar_isalnum().

py/misc.h

@@ -140,6 +140,7 @@ bool unichar_isprint(unichar c);
 bool unichar_isdigit(unichar c);
 bool unichar_isxdigit(unichar c);
 bool unichar_isident(unichar c);
+bool unichar_isalnum(unichar c);
 bool unichar_isupper(unichar c);
 bool unichar_islower(unichar c);
 unichar unichar_tolower(unichar c);

py/unicode.c

@@ -140,6 +140,10 @@ bool unichar_isident(unichar c) {
     return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0 || c == '_');
 }
 
+bool unichar_isalnum(unichar c) {
+    return c < 128 && ((attr[c] & (FL_ALPHA | FL_DIGIT)) != 0);
+}
+
 bool unichar_isupper(unichar c) {
     return c < 128 && (attr[c] & FL_UPPER) != 0;
 }