update json encoding and decoding of doubles #1157

Job	Run time
analyze_and_format; Dart 3.6.0; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_...	3m 38s
mono_repo self validate	26s
analyze_and_format; Dart dev; PKGS: _test, _test_package, discoveryapis_commons, discoveryapis_ge...	3m 32s
unittest; Dart 3.6.0; PKG: _test_package; `dart test`	28s
unittest; Dart 3.6.0; PKG: discoveryapis_commons; `dart test`	24s
unittest; Dart dev; PKG: generated/googleapis_beta; `dart test`	30s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p vm`	33s
unittest; Dart 3.6.0; PKG: discoveryapis_generator; `dart test`	29s
unittest; Dart 3.6.0; PKG: googleapis_auth; `dart test -p chrome --compiler dart2js,dart2wasm`	1m 40s
unittest; Dart dev; PKG: googleapis_auth; `dart test -p chrome --compiler dart2js,dart2wasm`	1m 14s
unittest; Dart 3.6.0; PKG: generated/googleapis_beta; `dart test`	36s
unittest; Dart dev; PKG: _test_package; `dart test`	29s
unittest; Dart 3.6.0; PKG: generated/googleapis; `dart test`	2m 4s
unittest; Dart dev; PKG: discoveryapis_commons; `dart test`	36s
unittest; Dart dev; PKG: discoveryapis_generator; `dart test`	37s
unittest; Dart 3.6.0; PKG: googleapis_auth; `dart test -p vm`	27s
unittest; Dart dev; PKG: generated/googleapis; `dart test`	2m 19s
	20m 2s

Provide feedback