Soft-fail integer conversion from JS values that are not representable

[kateinoigakukun]

Close #258

[github-actions]

Time Change: +419ms (4%)

Total Time: 9,712ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	20ms	+1ms (6%)	🔍
Serialization/JavaScript function call through Wasm import with int	16ms	+2ms (14%)	⚠️
Serialization/JavaScript function call from Swift	112ms	+16ms (13%)	⚠️
Serialization/Swift Int to JavaScript with assignment	338ms	+22ms (6%)	🔍
Serialization/Swift Int to JavaScript with call	980ms	+52ms (5%)	🔍
Serialization/JavaScript Number to Swift Int	312ms	+23ms (7%)	🔍
Serialization/Swift String to JavaScript with assignment	409ms	+32ms (7%)	🔍

View Unchanged

Test name	Duration	Change
Serialization/Swift String to JavaScript with call	1,021ms	+44ms (4%)
Serialization/JavaScript String to Swift String	3,784ms	+167ms (4%)
Object heap/Increment and decrement RC	2,706ms	+59ms (2%)

View Baselines

Test name	Duration
Serialization/Call JavaScript function directly	3ms
Serialization/Assign JavaScript number directly	3ms
Serialization/Call with JavaScript number directly	3ms
Serialization/Write JavaScript string directly	3ms
Serialization/Call with JavaScript string directly	2ms