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• hongbo/pad_start_end
• 0722
• 0722-json
• 0722-reinterpre
• 0727-clean
• 08-27-bool
• 08-27-buffer
• 0819-cmp
• 0819-coverage
• 0823-option-err
• 0831
• 0914-map-from-array
• 0918-strconv
• 0927-deque
• 0929-cmp
• 0929-pq
• 0929-quickcheck
• 1014-hashmap
• 1028-iterator
• 1106-alias
• 16-bit-ops
• 5eq7ow-codex/group-deprecated-functions-into-deprecated.mbt
• Asterless/map-enhancement-1
• Asterless/map-enhancement-2
• Feat/@ArrayView-blit_to()
• Feat/@Bytes-blit_from
• Feat/@String
• Feat/UInt16
• Feat/char_length
• Feat/priority
• Guest0x0/adapt-compiler-change
• Guest0x0/add-byte-op-mod
• Guest0x0/add-error-tojson
• Guest0x0/add-map-get-by-view
• Guest0x0/add-operators-trait
• Guest0x0/add-prelude-dep-to-test
• Guest0x0/add-prelude-dep-to-tests
• Guest0x0/bytes-searching
• Guest0x0/cleanup-method-as-func
• Guest0x0/deprecate-char-op-sub
• Guest0x0/deprecate-old-operator-names
• Guest0x0/external-iterator
• Guest0x0/fix-bleeding-ICE
• Guest0x0/fix-builtin-method-qualification
• Guest0x0/fix-dotdot
• Guest0x0/fix-leak
• Guest0x0/fix-local-deprecated
• Guest0x0/fix-some-to-string
• Guest0x0/fix-unused-impl
• Guest0x0/fix-unused-trait-bound
• Guest0x0/fix-unused-var
• Guest0x0/fix-warnings
• Guest0x0/iterator2
• Guest0x0/migrate-core
• Guest0x0/migrate-syntax-change
• Guest0x0/migrate-type-alias
• Guest0x0/move-fixedarray-eq-to-builtin
• Guest0x0/move-set-outside-builtin
• Guest0x0/no-unqualified-methods-in-builtin
• Guest0x0/port-method-to-impl
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• Guest0x0/prelude-alias-for-Iterator2
• Guest0x0/refactor-compare
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• Guest0x0/remove-bang
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• Guest0x0/separate-package-for-builtin-types
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• Implement-shuffle
• Rafactor/@Builtin-ErrorPolymorphism
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• Refactor/@Set,@Map-ErrorPolymorphism
• Refactor/rev_iter2
• Show-for-Failure
• Yu-zh/remove-legacy-intrinsic
• Yu-zh/update-ci
• abstract-bytesview
• abstract_ops
• add-FixedArray-is_empty
• add-abort-readme
• add-builtin-attr
• add-comment-for-int-impl-hash
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• add-comprehensive-tests-coverage-20250724-022320
• add-doc-badge
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• aligning-array-and-deque-api
• aligning-array-and-deque-api-append
• aligning-deque-api-blit_to
• aligning-deque-api-chunks-chunk_by
• aligning-deque-api-extract_if
• aligning-deque-api-filter
• aligning-deque-api-insert-remove
• aligning-deque-api-traits
• annotate-intrinsic
• arr-test
• array-bound-check
• array-test
• array-truncate
• array-view-impl-eq-compare
• array-view-map
• arrayview-methods
• arrayview-methods-1
• atan2
• attribute-deprecated
• avoid-string-add
• badge
• bench
• bench-import
• bench-keep
• bench-refactoring
• bench-with-subname
• better_log10_implementation
• better_trig_func_impl
• bigint-cmp
• bigint-from_int
• bigint-hash
• bigint_lop
• binary_search_by
• bitstring
• bitstring-return-unsigned
• bitstring-test
• bleeding/fix-fmt
• bleeding/migrate-core
• bleeding/test_ci
• bleeding_ci
• blit-from-bytesview
• buffer-from
• buffer-test
• buffer-write-stringview
• buffer_changes
• builtin-char-test
• builtin/string/substring-twice-length
• bytes_converter
• bytesview-eq
• byteview
• change-type-of-string-op-get
• char-pattern
• char_convertor
• char_methods
• charsview
• chore-0715
• chore-add-release-test-in-native-backend-in-check.yml
• chore-arrow
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• chore/update-copyright-year
• ci-pretty
• ci-test-native-release
• ci/bleeding-to-nightly
• ci/drop-macos-13
• ci/no-dedup-check-macos
• ci/pre-release-check-branch-match
• ci/pre-release-refine
• ci/ubuntu-coverage
• clean-js-warnings
• clean-up-alert-deprecated
• clean-up-reserved-usage
• clean-up-test-name
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• clean-warning
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• cmp-value
• codepoint-length
• codex/add-missing-eof-newline-to-json-configs
• codex/add-tests-to-increase-code-coverage
• codex/add-tests-to-increase-coverage
• codex/add-tests-to-increase-coverage-for-package-string
• codex/address-github-issue-2551
• codex/analyze-code-for-performance-improvements
• codex/continue-modernizing-codebase
• codex/deprecate-immut/list-package
• codex/find-and-fix-bug
• codex/find-easy-tasks-for-pr
• codex/find-performance-improvement-opportunities
• codex/find-performance-improvements
• codex/find-performance-optimization-tasks
• codex/group-deprecated-functions-into-deprecated.mbt
• codex/group-related-functions-into-single-file
• codex/identify-and-implement-missing-package
• codex/identify-performance-improvement-opportunities
• codex/improve-documentation-for-public-functions
• codex/investigate-issue-#2233-on-github
• codex/modernize-code-base-using-arrow-functions-and-simplified-loo
• codex/modernize-code-base-with-arrow-functions
• codex/modernize-code-base-with-arrow-functions-and-loops
• codex/modernize-codebase-with-arrow-functions
• codex/modernize-codebase-with-arrow-functions-and-for-loops
• codex/modernize-for-loop-syntax
• codex/refactor-and-group-functions-in-moonbit
• codex/resolve-merge-conflict-and-format-code
• codex/review-readme.mbt.md-for-documentation-improvements
• codex/run-moon-coverage-analyze-and-add-tests
• codex/update-code-to-use-expr-instead-of-notexpr
• codex/update-comments-for-mutableset-references
• codex/update-int64-mask-and-tests
• compare
• const-int
• contains
• copilot/add-merge-functions-to-map
• copilot/fix-3a04e04d-f721-4511-8690-85f358ccab32
• copilot/fix-4f20cbce-c66c-4d31-9434-896a1dc74d96
• copilot/fix-5988d796-b84e-48a1-8c4c-1f607c7c1f3e
• copilot/fix-5e565db6-7f9f-4a79-b21a-d5812747dcc2
• copilot/fix-6c85429b-2ebd-4931-8f93-b4f01a646f6c
• copilot/fix-73562b10-d4e6-49ab-9034-ad8d1e1060ef
• copilot/fix-7fd5ffe3-01ec-439e-8f6c-c0a2c55272c9
• copilot/impl-tostringview-for-char
• copilot/improve-int-to-string-performance
• copilot/improve-to-string-methods
• copilot/sub-pr-2948
• copilot/unify-from-array-and-of
• copilot/update-lookup-tables-to-readonlyarray
• copilot/update-parse-method-parameter
• cov-from-json-bool
• cov/array-sort
• cov/char_sub
• coverage-hamt
• coverage_ci
• cursor/add-meaningful-tests-and-insights-cfa6
• cursor/add-meaningful-tests-to-increase-coverage-24c6
• cursor/analyze-and-cover-important-uncovered-code-acf2
• cursor/debug-repository-and-format-4fb7
• decimal
• decimal-to-string
• default-int16
• default-start
• depreate-sorted-set-of
• deprecate
• deprecate-Deque-truncate
• deprecate-bytes-blit
• deprecate-message-option
• deprecate-result-fold
• deprecate-sortedmap-new
• deprecate-string-op-get
• deque-bug
• deque-to_array
• deque_test
• dev
• doc-array
• doc-bool
• doc-buffer
• doc-builtin
• doc-builtin-array
• doc-bytes
• doc-char-intrinsics
• doc-deque
• doc-double
• doc-error
• doc-float
• doc-hashmap
• doc-int
• doc-int64
• docimp
• docs-Array_blit_to
• docs-add-alert-unsafe
• docs-array-push-iter
• docs-tuple-msg
• docs_test
• double-to-uint
• draft-rev_unfold-01
• edit-stringview
• enhance-documentation-readmes
• eq-stringview
• exegesis
• fabs
• feat-Map-string-method
• feat-add-Iter-flatten
• feat-add-default-impl-for-Compare-trait
• feat-add-maximum-minimum
• feat-add-other-function-for-Iter2
• feat-array-get
• feat-bigint-to-int
• feat-bool-to-int
• feat-byte-to-double
• feat-clone-trait
• feat-list-find-index
• feat-to_array_size_hint
• feat/array-unzip
• feat/bytes-to-from-json
• feat/check-add
• feat/cmp-by-key
• feat/count_ones
• feat/deque-as-views
• feat/deque-copy
• feat/deque-filter-map-inplace
• feat/deque-retain
• feat/deque-rev-iter
• feat/deque-truncate
• feat/dump
• feat/expose_error_func
• feat/iter2-concat
• feat/map-methods
• feat/queue-clear-null
• feat/strconv-decimal-show
• feat/stringbuilder-is-empty
• feature/20250522_HAMT
• feature/map-enhancement
• filter-map-rename
• fix
• fix-Array_blit_to
• fix-abort
• fix-atan-inf-input
• fix-bigint
• fix-bigint-to_int64-js-backend
• fix-bits-pattern-warning
• fix-bitstring
• fix-blit_from_string
• fix-bytes-make-panic
• fix-clock-on-llvm
• fix-comp-sorted-set
• fix-contributing
• fix-depreated-msg
• fix-deprecated
• fix-deprecated-msg
• fix-doc
• fix-docs-Array_blit_to
• fix-error-to-json
• fix-fixedarray-blit_to
• fix-fixedarray-from_array_test
• fix-heap
• fix-immut-hashmap
• fix-int-to-string-wasmgc
• fix-intrinsic
• fix-iter-take
• fix-list-tail
• fix-meth-list
• fix-missing-pragma
• fix-parse-int
• fix-pq
• fix-rational
• fix-redundant-loc
• fix-ref
• fix-remove-redundant-prefix
• fix-set_utf16be_char
• fix-signed-integer-overflow
• fix-stackoverflow-when-passing-closure
• fix-string-make
• fix-surrogate-varnames
• fix-trig-test-syntax
• fix-typo-module
• fix-view-todo
• fix-warning-when-moon-test-doc
• fix-wasm-unnamed-index
• fix-windows-ci
• fix/deque-push
• fix/deque-retain-map
• fix/deque-set
• fix/deque-truncate
• fix/float-moon-pkg-json-format
• fix/improve-native-now
• fix/json-internal_types
• fix/replace-x-escape
• fix/string-json-round-trip
• fix1
• fix3
• fix_fmod
• fix_log_when_input_is_neg_inf
• fixedarray-bits-operation
• fixedarray-swap
• fixedarray-take-view
• float-hash
• float-utils
• for-in
• format
• from-json-unicode
• from_json
• gh-readonly-queue/main/pr-1489-9d700ab5524a300f9c30d8761d5d7c17dc45bfa0
• gh-readonly-queue/main/pr-1494-22f06f3dbf8d359065ea5b1d16863c6f1e26b8d8
• gh-readonly-queue/main/pr-1518-4612955fd89a425a1f811953d70fabdeb996882e
• gh-readonly-queue/main/pr-1523-d1d9cd63972b2499d38cf20feee7add6d3697dd3
• gh-readonly-queue/main/pr-1527-f114824d9f99d2d07a4d69605c91be4f36adb798
• gh-readonly-queue/main/pr-1529-6fe8a89e07758e1202401e30588165ab9afe633b
• gh-readonly-queue/main/pr-1530-2afd49beb01fcdc9a24634ea92f238ad12ec3965
• gh-readonly-queue/main/pr-1531-d153abaecfd2e6a68ba164801797704491562f68
• gh-readonly-queue/main/pr-1532-e7de6a8c3af736fe9b7ca830324ffbdd738e4793
• gh-readonly-queue/main/pr-1534-2e9a4f5571e9380613e8d0e8013199cb71e20ea6
• gh-readonly-queue/main/pr-1535-e19827c0aebb8790b310df51886f8978f5fb42aa
• gh-readonly-queue/main/pr-1536-6b9854c68d773c8dca3be5029997890928fb93fa
• gh-readonly-queue/main/pr-1537-1de261adc4d900269d101e4bb906e0022c05c405
• gh-readonly-queue/main/pr-1538-f458978b927f9f67850889bd353a744d52823fda
• gh-readonly-queue/main/pr-1539-8cd3c04bb2bf0159fa04814931eceef4d4810bd8
• gh-readonly-queue/main/pr-1540-152db9701df19f721434b41be1ed04d29268a1fd
• gh-readonly-queue/main/pr-1541-3fa6c5fc92199ee3007589cb7fb401d18361b48d
• gh-readonly-queue/main/pr-1542-244321db9a6935c499c543d290eb382947bbfb8d
• gh-readonly-queue/main/pr-1543-e3c99f35bd56894cfd7042a2b3b793ace5f4acc6
• gh-readonly-queue/main/pr-1544-15910391621df7da449b3e36a147bf4f2ace84fb
• gh-readonly-queue/main/pr-1545-7b375de5e7994817f69d4ff5ef4a920c524bf688
• gh-readonly-queue/main/pr-1546-e526c2de0874f790022801bbe3f3fb2e55f218b2
• gh-readonly-queue/main/pr-1547-236c7e36c682b4ff4ac19272e9b891dec57b2336
• gh-readonly-queue/main/pr-1548-15583d46b5245284b172e447b6a952fff119d42e
• gh-readonly-queue/main/pr-1549-9dea38bde520d476f240e55d44725e0b65c481d8
• gh-readonly-queue/main/pr-1552-64c2ae8e8f075b6a125d161e4f6d1e99e849b826
• gh-readonly-queue/main/pr-1553-59cba88d44e373caa0a6f03061863292cd4646b5
• gh-readonly-queue/main/pr-1555-29ffae88e720a3337a7810098a76c462d00f912f
• gh-readonly-queue/main/pr-1556-1c00d1369beca7c7fa1ceede554536728aef1d67
• gh-readonly-queue/main/pr-1557-f6095c379012a08b1aefd97cd3c56293bf7f40ee
• gh-readonly-queue/main/pr-1560-5b7fef5b0e68c6b8fbbcf71c6f2e17e985c1fb84
• gh-readonly-queue/main/pr-1561-135ceb16e946d0232384680a860753131d952764
• gh-readonly-queue/main/pr-1562-aa239b598b6ddcdb0d5dda2e85f6bb4d1e89f4db
• gh-readonly-queue/main/pr-1563-b2878ed99a2fa7be903554c1eba6e4480b89903b
• gh-readonly-queue/main/pr-1564-78c8eed5ea305891d9a3f4abc73ccb2ca4ea1dcf
• gh-readonly-queue/main/pr-1567-f8f18ebdec95e4e61f51278ac897a5949d2fde26
• gh-readonly-queue/main/pr-1568-920bcfaebf90b6416ae64f5002d4b7d492288735
• gh-readonly-queue/main/pr-1569-530a51eb8d715c68c053ccf0183e52619d4b0f74
• gh-readonly-queue/main/pr-1570-ddb99465392906022db5c42a14c415d802f2d943
• gh-readonly-queue/main/pr-1571-46e7789a6c6f234a551dcef7150ff558f32921f9
• gh-readonly-queue/main/pr-1572-ce9fcdfa8da6d9c544f5bd2accdfb2fbf69d2865
• gh-readonly-queue/main/pr-1573-dca313d7f861a12f65289d70794356bbb6f006a7
• gh-readonly-queue/main/pr-1574-9e073bafa7c7aeb94c546f54d44fd418b03a56a7
• gh-readonly-queue/main/pr-1576-5bebf820621c2dc35550519ac66c9798fd949ca2
• gh-readonly-queue/main/pr-1578-c073535b2e866ad83655388b76bd53301f1a74f6
• gh-readonly-queue/main/pr-1579-91f138eea956b20340c768a73929bedd90a555b1
• gh-readonly-queue/main/pr-1580-8421d62553f26832b9accee74784f5354319547a
• gh-readonly-queue/main/pr-1581-0dd9b2df20c034b2b9a2fb90ec2af67d20f4c4c7
• haoxiang/fixedarray-from-array
• haoxiang/json-parse-string-view
• haoxiang/update-README
• honbo/Iter_iter2_test
• hongbo/Byte_makei_error
• hongbo/add_agents.md
• hongbo/add_json_for_failure
• hongbo/add_one_more_test
• hongbo/agents.md
• hongbo/ai_coverage
• hongbo/ai_generated_docs
• hongbo/align_rust_option
• hongbo/api_cleanups
• hongbo/arbitrary_refactor
• hongbo/array_test
• hongbo/array_view_conversion
• hongbo/arrayview_each_no_bounds
• hongbo/at_get_at_unsafe
• hongbo/attr_test
• hongbo/batch_review
• hongbo/buffer
• hongbo/bug_of_expose_primitive
• hongbo/bytes
• hongbo/bytes_add
• hongbo/bytes_bytesview_consistency
• hongbo/bytes_pattern_test
• hongbo/bytes_repeat
• hongbo/bytesview
• hongbo/bytesview_test
• hongbo/bytesview_to_json
• hongbo/cfg_test_not_working
• hongbo/char_escape_test
• hongbo/char_is_bmp
• hongbo/char_is_printable
• hongbo/char_style
• hongbo/char_test
• hongbo/char_tweak
• hongbo/clean18
• hongbo/cleanup_deprecated
• hongbo/cleanup_deprecated2
• hongbo/cleanup_typealias
• hongbo/cleanup_warnings
• hongbo/close_to_float_double
• hongbo/config_false_bug
• hongbo/contains_kv
• hongbo/continue_types_renaming
• hongbo/contributions
• hongbo/coverage
• hongbo/coverage_add
• hongbo/deprecate_be_functions
• hongbo/deprecate_charcodes
• hongbo/deprecate_option_methods
• hongbo/deprecate_string_sub
• hongbo/deprecate_to_bytes
• hongbo/deque_json
• hongbo/derive_to_json_for_failure
• hongbo/docs_about_dump
• hongbo/docs_string
• hongbo/dps_test
• hongbo/example-failed-update
• hongbo/factor_double
• hongbo/factor_out_char
• hongbo/factor_out_ref
• hongbo/factor_out_slice
• hongbo/finish_immut_types_naming
• hongbo/finish_types_renaming
• hongbo/fix_1322_by_AI
• hongbo/fix_bench_api
• hongbo/fix_deprecate_warnings
• hongbo/fix_docs
• hongbo/fix_json_unicode_error
• hongbo/fix_test_api
• hongbo/fix_warnings
• hongbo/flip_order
• hongbo/fmt12
• hongbo/fmt20
• hongbo/fmt33
• hongbo/fmt_doc
• hongbo/fmt_info
• hongbo/from_array
• hongbo/future_proof
• hongbo/guard_feature_test
• hongbo/hashmap_contains_kv
• hongbo/hashmap_to_json
• hongbo/hide_internal_api
• hongbo/high_order_callback_with_error
• hongbo/high_quality_coverage
• hongbo/ice
• hongbo/immutable_array_view
• hongbo/info
• hongbo/info3
• hongbo/int_methods
• hongbo/int_min_max_clamp
• hongbo/iter_group_by
• hongbo/iter_mutable_map_set
• hongbo/iter_to_json
• hongbo/iterator_experimental
• hongbo/json_api_and_list
• hongbo/json_auto_test
• hongbo/json_flat
• hongbo/json_flat_failure
• hongbo/json_more_tests
• hongbo/json_null
• hongbo/json_parser_bug
• hongbo/json_refactor
• hongbo/json_replacer
• hongbo/json_test
• hongbo/jsonpath_mut
• hongbo/label_migration
• hongbo/labeled_break
• hongbo/last_tweak
• hongbo/less_fnalias
• hongbo/license_update
• hongbo/list_equal
• hongbo/local_type_issues
• hongbo/locals
• hongbo/make_doc_pass
• hongbo/make_test_abstract
• hongbo/map_length_alias
• hongbo/map_merge
• hongbo/map_view
• hongbo/markdown_api
• hongbo/micro-optimize-cover
• hongbo/migrate_json
• hongbo/migrate_stringview
• hongbo/migration_plan
• hongbo/modernize_core
• hongbo/modularize_parse_context
• hongbo/moonagent_docs
• hongbo/moonagent_tests
• hongbo/more_coverages
• hongbo/more_docs_from_moonagent
• hongbo/more_docs_in_test
• hongbo/more_random_tests
• hongbo/more_sort_docs
• hongbo/more_tests_json
• hongbo/move_float
• hongbo/move_float_method_to_package
• hongbo/move_inproper_method
• hongbo/move_t_to_list
• hongbo/new_iter
• hongbo/no-fna-alias-a
• hongbo/no_ddot_dot
• hongbo/no_fn_alias
• hongbo/no_guard_let
• hongbo/no_log_in_test
• hongbo/no_pre_commit
• hongbo/no_unsafe_pop
• hongbo/normal_name_convention
• hongbo/not_test_deprecated
• hongbo/operator_up
• hongbo/package-full-docs
• hongbo/package_prefix
• hongbo/parallel_api
• hongbo/pre-commit-hooks
• hongbo/prepare_string_migration
• hongbo/prune_loc_json
• hongbo/queue_to_json
• hongbo/rational_docs
• hongbo/readonlyarray
• hongbo/refactor11
• hongbo/refactor12
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Build # 544

Build Type

Pull #2500

github

Committed by bobzhang

Commit Message

align String::pad_start with JS semantics (not counting char length)

the rationale is that counting char_length is not enough, we need do more complex graphime.

Bottom Line
I'd follow JavaScript's semantics because:
It maintains consistency with your UTF-16-based API
It's predictable and performant
Most real padding use cases don't involve emojis
You can always add character-aware variants later if needed
The current design mixing UTF-16 offsets with character counting creates more confusion than the occasional visual incorrectness with emojis.

Pull Request Pull Request #2500: align String::pad_start with JS semantics (not counting char length)

Run Details

8 of 8 new or added lines in 1 file covered. (100.0%)

2 existing lines in 1 file now uncovered.

8531 of 9468 relevant lines covered (90.1%)

228751.61 hits per line