导入顺序对 ByteString 类型签名的影响

Question

我对 GHCI 在 Data.ByteString 和 Data.ByteString.Char8 周围的行为感到困惑。如果我使用以下导入加载文件

import qualified Data.Text as T
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as BC
import qualified Data.Text.Encoding as E

我明白了

*Main> :t E.encodeUtf8
E.encodeUtf8 :: T.Text -> BC.ByteString

如果我将第二个和第三个导入行反转为

import qualified Data.Text as T
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString as B
import qualified Data.Text.Encoding as E

我明白了

*Main> :t E.encodeUtf8
E.encodeUtf8 :: T.Text -> B.ByteString

我认为 Data.ByteString 和 Data.ByteString.Char8 共享相同的 ByteString 类型，但我不知道如何理解它。

Answer 1

我认为 sjakobi 的评论回答了这个问题：

These modules do export the very same ByteString type. The difference between these modules is in the functions they expose.

导入顺序对 ByteString 类型签名的影响

Effect of import order on ByteString type signature

haskell

bytestring