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Support unambiguous detection of language if only prefixes are supplied #106

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pjkundert
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If a BIP-39 Mnemonic is supplied that contains word prefixes (such as would be resolved by calling Mnemonic.expand), the Mnemonic.detect_language function fails. This fix simply allows detect_language to proceed until the prefix no longer appears in multiple language dictionaries.

Also, we detect that ambiguity no longer exists (less than 2 languages remain), and we suspend t the search.

Tests added to confirm that the search proceeds in the face of prefixes available in multiple languages.

@matejcik matejcik mentioned this pull request Jun 29, 2023
@pjkundert pjkundert force-pushed the feature-language-prefixes branch from 48ccd87 to 07a4be4 Compare November 11, 2023 23:18
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Hi, @matejcik -- sorry for not bringing this up-to-date earlier! It should now be ready for the next release. Thanks!

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Turns out supporting prefixes in language deduction was more complex than I though...

The present implementation correctly resolves ambiguity, by requiring exactly one language to match word(s) fully, if all words are prefixes in multiple languages.

Only completely unambiguous codes pass language deduction.

@pjkundert pjkundert force-pushed the feature-language-prefixes branch from 01393e4 to cf7df0a Compare November 12, 2023 14:46
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matejcik commented Jan 5, 2024

merged as 4b14fc5

@matejcik matejcik closed this Jan 5, 2024
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