Upper case bech32 not recognized

[FelixWeis]

According to the bech32 spec, there is no distinction between upper/lower case. some QR codes use a special mode where they only use UPPER case to encode the data more efficiently.

[mrfelton]

@FelixWeis could you give an example of one of these QR codes?

[mrfelton]

Here is the relevant part of the spec:

https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#specification

The lowercase form is used when determining a character's value for checksum purposes.

Encoders MUST always output an all lowercase Bech32 string. If an uppercase version of the encoding result is desired, (e.g.- for presentation purposes, or QR code use), then an uppercasing procedure can be performed external to the encoding process.

Decoders MUST NOT accept strings where some characters are uppercase and some are lowercase (such strings are referred to as mixed case strings).

For presentation, lowercase is usually preferable, but inside QR codes uppercase SHOULD be used, as those permit the use of alphanumeric mode, which is 45% more compact than the normal byte mode.