Hi, I'm writing a JSON serialization test case for the `type Price =
tuple[price: float, currency: string]` type, and have 2 issues:
1. How to parse custom JSON format `"214.05 USD".parse_json.to(Price)`,
currently it fails complaining JSON is invalid, although it would work if it
were inside of some other JSON object, like `{ price: "214.05 USD" }`.
2. Another strange error when equality `assert Price.init(214.05,
"USD").to_json == "214.05 USD"` fails, although it seems that the `to_json`
outputs the same string `"214.05 USD"`.
Code and the [playground](https://play.nim-lang.org/#ix=2KkV):
import strformat, json, strutils
type Price = tuple[price: float, currency: string]
proc init*(_: typedesc[Price], raw: string): Price =
let parts = raw.split(" ")
assert parts.len == 2, fmt"invalid price '{raw}'"
(parse_float(parts[0]), parts[1])
proc init*(_: typedesc[Price], price: float, currency: string): Price =
(price, currency)
func `$`*(v: Price): string =
fmt"{v.price} {v.currency}"
func `%`*(s: Price): JsonNode =
%($s)
proc init_from_json*(dst: var Price, json: JsonNode, json_path: string) =
dst = Price.init(json.get_str)
proc to_s*[T](v: T): string = $v
proc to_json*[T](v: T): string = (%v).pretty
# Testing
let price = Price.init(214.05, "USD")
assert price.to_s == "214.05 USD"
assert price.to_json == "214.05 USD" #
Strange error N1
assert "214.05 USD".parse_json.to(Price) == Price.init(214.05, "USD") #
JSON parsing error N2
Run
