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Clarify difference with Crockford's base32 #57

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Clarify difference with Crockford's base32 #57

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4 changes: 3 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,9 @@ ulid() // 01ARZ3NDEKTSV4RRFFQ69G5FAV
- 1.21e+24 unique ULIDs per millisecond
- Lexicographically sortable!
- Canonically encoded as a 26 character string, as opposed to the 36 character UUID
- Uses Crockford's base32 for better efficiency and readability (5 bits per character)
- Uses subset of Crockford's base32 for better efficiency and readability (5 bits per character)
- Major difference with `Crockford's base32` is not be able to contain `iIlLoO` and `hyphens(-)`
- All characters except `0123456789ABCDEFGHJKMNPQRSTVWXYZabcdefghjkmnpqrstvwxyz` are invalid in ULID
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I know a suggestion exists to restrict only for uppercase #3
But this PR does not scope it 🙇

- Case insensitive
- No special characters (URL safe)
- Monotonic sort order (correctly detects and handles the same millisecond)
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