01|absence|null/absent/empty distinguished; null API contracts asserted
01|U+180E|runtime=21|jdkWS=false|spaceChar=false|commons=false|guava=false
01|empty|length=0|codePoints=0|trim=true|jdkWS=true|spaceChar=true|guava=true|commons=true|isBlank=true
01|SPACE|length=1|codePoints=1|trim=true|jdkWS=true|spaceChar=true|guava=true|commons=true|isBlank=true
01|TAB|length=1|codePoints=1|trim=true|jdkWS=true|spaceChar=false|guava=true|commons=true|isBlank=true
01|CRLF|length=2|codePoints=2|trim=true|jdkWS=true|spaceChar=false|guava=true|commons=true|isBlank=true
01|NUL|length=1|codePoints=1|trim=true|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|FS|length=1|codePoints=1|trim=true|jdkWS=true|spaceChar=false|guava=false|commons=true|isBlank=true
01|NBSP|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=true|guava=true|commons=false|isBlank=false
01|FIGURE_SPACE|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=true|guava=true|commons=false|isBlank=false
01|NARROW_NBSP|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=true|guava=true|commons=false|isBlank=false
01|EM_SPACE|length=1|codePoints=1|trim=false|jdkWS=true|spaceChar=true|guava=true|commons=true|isBlank=true
01|ZERO_WIDTH_SPACE|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|IDEOGRAPHIC_SPACE|length=1|codePoints=1|trim=false|jdkWS=true|spaceChar=true|guava=true|commons=true|isBlank=true
01|NEL|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=false|guava=true|commons=false|isBlank=false
01|LETTER|length=3|codePoints=3|trim=false|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|SUPPLEMENTARY|length=2|codePoints=1|trim=false|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|LONE_HIGH_SURROGATE|length=1|codePoints=1|trim=false|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|SPACE_AND_SURROGATE|length=2|codePoints=2|trim=false|jdkWS=false|spaceChar=false|guava=false|commons=false|isBlank=false
01|sku|valid original preserved; 8 invalid values rejected; trim collision demonstrated