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[DOC] Explain that transcoding to the same encoding just copies.

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This is a reenstatement of the explanation in commit
463633e4a9 to partially
address Bug #19342.
This commit is contained in:
Martin Dürst 2023-01-16 16:25:04 +09:00
parent 468ce1488d
commit 11f28f3268
1 changed files with 6 additions and 0 deletions
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6
doc/string/encode.rdoc
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@ -38,3 +38,9 @@ interprets +self+ using +src_encoding+, encodes the new string using +dst_encodi
Optional keyword arguments +enc_opts+ specify encoding options; Optional keyword arguments +enc_opts+ specify encoding options;
see {Encoding Options}[rdoc-ref:encodings.rdoc@Encoding+Options]. see {Encoding Options}[rdoc-ref:encodings.rdoc@Encoding+Options].
Please note that conversion from an encoding +enc+ to the same encoding
+enc+ (independent of whether +enc+ is given explicitly or implicitly)
is a no-op, i.e. the string is simply copied without any changes, and
no exceptions are raised, even if there are invalid bytes.