py/objarray: Turn on MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE for memoryview.

And add corresponding tests.

Fixes micropython#5674 (comparison of memoryview against bytes).

Author: jimmo

py/objarray.c

@@ -573,6 +573,7 @@ const mp_obj_type_t mp_type_bytearray = {
 #if MICROPY_PY_BUILTINS_MEMORYVIEW
 const mp_obj_type_t mp_type_memoryview = {
     { &mp_type_type },
+    .flags = MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE,
     .name = MP_QSTR_memoryview,
     .make_new = memoryview_make_new,
     .getiter = array_iterator_new,

tests/basics/memoryview1.py

@@ -107,3 +107,21 @@
     memoryview(b'a').noexist
 except AttributeError:
     print('AttributeError')
+
+# equality
+print(memoryview(b'abc') == b'abc')
+print(memoryview(b'abc') != b'abc')
+print(memoryview(b'abc') == b'xyz')
+print(memoryview(b'abc') != b'xyz')
+print(b'abc' == memoryview(b'abc'))
+print(b'abc' != memoryview(b'abc'))
+print(b'abc' == memoryview(b'xyz'))
+print(b'abc' != memoryview(b'xyz'))
+print(memoryview(b'abcdef')[2:4] == b'cd')
+print(memoryview(b'abcdef')[2:4] != b'cd')
+print(memoryview(b'abcdef')[2:4] == b'xy')
+print(memoryview(b'abcdef')[2:4] != b'xy')
+print(b'cd' == memoryview(b'abcdef')[2:4])
+print(b'cd' != memoryview(b'abcdef')[2:4])
+print(b'xy' == memoryview(b'abcdef')[2:4])
+print(b'xy' != memoryview(b'abcdef')[2:4])