Sourced from terser's changelog.

v4.8.1 (backport)

• Security fix for RegExps that should not be evaluated (regexp DDOS)

v4.8.0

• Support for numeric separators (million = 1_000_000) was added.
• Assigning properties to a class is now assumed to be pure.
• Fixed bug where yield wasn't considered a valid property key in generators.

v4.7.0

• A bug was fixed where an arrow function would have the wrong size
• arguments object is now considered safe to retrieve properties from (useful for length, or 0) even when pure_getters is not set.
• Fixed erroneous const declarations without value (which is invalid) in some corner cases when using collapse_vars.

v4.6.13

• Fixed issue where ES5 object properties were being turned into ES6 object properties due to more lax unicode rules.
• Fixed parsing of BigInt with lowercase e in them.

v4.6.12

• Fixed subtree comparison code, making it see that [1,[2, 3]] is different from [1, 2, [3]]
• Printing of unicode identifiers has been improved

• 40674a4 update changelog, version
• d8cc569 backport fix to potential regexp DDOS
• 504b967 4.8.0
• 9f380dc update changelog
• 7dd0b9d update assumptions
• cfad907 Allow yield to be used as property key in generators.
• 283f44f Make class property assignment pure.
• ee965e8 Add numeric separators support (#725)
• ee6b8af 4.7.0
• 807f729 update changelog
• Additional commits viewable in compare view

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