Support Decimal

[yukinarit]

@envclass
@dataclass
class Hoge:
        d: Decimal

h = Hoge(d=Decimal(10))
os.environ['ENV_D'] = '20'

assert isinstance(h.d, Decimal)
assert h.d == Decimal(20)

[pranavvp10]

Hi @yukinarit can you be more specific for this?

[yukinarit]

@pranavvp10 Updated the description, PTAL