v4.12.31

What's Changed

• test(context): assert case-insensitive header names in response helpers by @yusukebe in #5116
• chore(benchmark): add app.fetch() overhead benchmark by @yusukebe in #5117
• refactor(aws-lambada): remove FIXME in @ts-expect-error by @yusukebe in #5130
• fix(utils/body): reuse cached formData in parseBody() by @yusukebe in #5131
• fix(request): fix multipart boundary mismatch in cloneRawRequest by @yusukebe in #5133
• fix(sse): emit retry feild when retry is 0 by @yusukebe in #5135
• test(validator): fix misspelled identifier in transform type test by @yusukebe in #5136

Full Changelog: v4.12.30...v4.12.31