fix: performance tweak #235

source/components/datatable/change-button.mjs

source/components/datatable/columnbar.mjs

source/components/datatable/dataset.mjs

source/components/datatable/datasource/rest.mjs

source/components/datatable/datatable.mjs

source/components/datatable/filter.mjs

source/components/datatable/filter/date-range.mjs

source/components/datatable/filter/range.mjs

source/components/datatable/save-button.mjs

source/components/datatable/util.mjs

source/components/tree-menu/tree-menu.mjs

source/dom/updater.mjs

source/types/observer.mjs

source/types/version.mjs

test/cases/monster.mjs

test/web/test.html

test/web/tests.js