Hi! Thanks for this excelent serializer!

Please add suport for big.Int and decimal.Big !

My main need is the following golang types
(biginteger,native) math/big.Int and (bigdecimal) github.com/ericlagergren/decimal.Big

for others langs I don't care, but I would suggest:
java => (biginteger, native) https://docs.oracle.com/javase/10/docs/api/java/math/BigInteger.html
(bigdecimal, native) https://docs.oracle.com/javase/10/docs/api/java/math/BigDecimal.html
JavaScrip => (biginteger, native) https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt
(or, biginteger) https://github.com/MikeMcl/decimal.js
(bigdecimal) https://github.com/MikeMcl/decimal.js
C => (biginteger) https://github.com/libtom/libtommath
(bigdecimal) https://github.com/libtom/libtomfloat

Thanks Very Very Very Much!

Best Whishes,
Dani.