<commit_before>accessing
isSubstitute: anObject

	^ substitutes identityIncludes: anObject<commit_msg>Use #includes: instead of #identityIncludes: with IdentityDictionary for improved performance.<commit_after>accessing
isSubstitute: anObject
	^ substitutes includes: anObject
{'fraction_non_alphanumeric': 0.06159420289855073, 'fraction_numerical': 0.0, 'mean_word_length': 9.653846153846153, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '4630877', 'n_tokens_mistral': 76, 'n_tokens_neox': 70, 'n_words': 20}